The material is UHMW
Here is the actual cost (at discount) for 1 piece of 1" thick by 4x8x10

BTDT,  tried to PM this but it said you do not accept PM's.
https://www.youtube.com/watch?v=wspQkY9AoXs
 
I'm kind of surprised Tuna didn't suggest this.  And I'm pretty sure Clint uses one.
 
I like your hummingbird, I have the same model, built my own box, too.  I've never used it to watch through the hole, but I used to carry a mix of Blue Juice and water, clear a spot on the ice, pour some liquid, put the 'ducer in the puddle, and it would give me sense of how deep I was.  Once I cut the hole, I'd go old school and drop a sounding weight, and then measure the line coming back up for accurate depth.  Limited Battery life in the cold, didn't want to burn it out with the TV fishing.

Thank you Lucky I appreciate that. I don't know why my PM would refuse, I'll check that out for sure. PM test sent.

Hey L-13. That's a good tip . I built 1 10 years ago but quite honestly never use it unless there is deep snow. Now that we have a snowmobile in the mix, I don't think I will ever use the smitty again.
It seems my 1 man FX 100 flip over is light enough to stay on top (37lbs) and easy enough to drag.  
 
Please don't be a stranger. Just because we have squabbles , I always find your information helpful .
Maybe we should create a grumpy old men section, I'd bet I would be the first one sent there , lol.
 
As for taking this weekend off, now that the deep freeze is back , FAT CHANCE !!!

1 other thing maybe I said before here is a spud bar . I've read other places of people just taking the ice safety for granted.
First off, I'd personally never drive my vehicle onto the ice . Not counting a luxury toy like an atv or snowmobile, I mean my transportation that gets me to work and back does not go out there.
I've seen and been with those who do but not mine.

Back to my review:
Eskimo redneck ice bar is a great tool.
At The price of $20.00 Not only is it a life saver, at the price, it's not worth trying to make one myself.
With this rain , soft edges and still open water on lake George, it's in my sled.
The buddy heater on the right, ugh, still throwing me fits. Yes I've cleaned the lines . I'm guessing thermocouple as Clint said

I know I'm hitting it hard but I tend to strike while the iron is hot . Otherwise my short term memory sucks.

I popped the bigger shanty up tonight after 2 days use sat and Sunday.
Tip : really gotta air and dry as much as possible in between weekends or else you may end up with a frozen shanty that won't set up.
Another hint is lubricate the zippers.
No oils !! I use candle wax. Any silicon wax or bar soap works , Irish spring smells nice as does lavender candle wax.

Caution:
If you dual purpose for hunting, air out weeks ahead from all those funky scents

Heyyy I like the Grumpy Old Men thingy, count me in. Not that anyone could ever think a sweet old guy liiii.... Ummm never mind.

Lucky I got the PM and thanks again for the vid. I love the way the system comes apart for easy storage until needed. Gives me a reason to buy a new compound miter saw too. Mine started throwing sparks and smelled funny.

Got out on the local ice this afternoon but I won't mention how I did. Stupid fish but, I did get to set up the Eskimo3 and did it all by myself in less then two minutes. Tearing down was just as quick and with use of the included strap, the thing went back in the bag like it knew where to go. Good thing to cause it was snowing and blowing and I don't think my fire insurance covers ice shanty's.

One last thing, if yinz have not tried predrilling the ice for the ice anchors you're causing yourself extra work. If it's the only thing ya pay attention to that I recommend, you need to try it.

I guarantee when you see how easy the anchors screw in without a drill adapter you'll wanna kiss me the next time you see me.

Try it, you'll like it. Ummm, the predrilling, you'll like the predrilling.

HT- The UHMW (Ultra High Molecular Weight polyethylene) is used as a shoe on the bottom of drift boats.  http://www.woodworkingshop.com/product/ph11240/?inMed=GSTORE&dfw_tracker=18711-5206&gclid=EAIaIQobChMIiZLfx6Xz2AIViIvICh2t8QjnEAYYCSABEgJojvD_BwE 
This is one of the many places you can get this product, just do a google search to find something to fit your needs.  

Troutbum thanks a bunch for posting that link, appreciate it.  That appears to be the material used on boat trailer bunks too and a heck of a lot cheaper.
 
Rechargeable battery update.  EverReady AA 600 mAh, fresh off the charger, for use in Baby Bubbles Air Pump.   4 hours constant run time per set of 2 batteries.  First set was put into action at 2:30 PM and replaced by the second set at 6:45 PM.  No complaints, cheaper then buying fresh sets of alkaline batteries every other day.  Just need to estimate the time you will be using the air pump and take a supply of batteries or purchase a larger capacity battery such as in the 2800 mAh range.
 
Do like those air pumps, still using fatheads (maintained in a gallon minnow bucket), purchased early last week.  Although, using aerators and changing water has kept the bait alive, the true reason for still having the minnows purchased last week is because, I can't catch any stupid fish.

The bubbler on right deemed (big) has lasted over 5 years.It's been through heck, kept herring alive and still producing. D cells last a ton longer then aa. It's predecessor lasted I don't know but made me buy another.
The baby bubbler on left has failed me multiple times and is only 1.5 years , I bout 2 . .has no azz , not waterproof and battery life is 6 hrs at best. Junk imo. Even at $4.00.
I'd rather get the waterproof reliable big guy at $8.00. Savings in long run.

The Busch, latest 10 mins after work