The only thing I will add is we use a lot of UHMW where I work and I mean a lot we buy it by the sheet up too 2'' thick to line chutes and hoppers. But the on thing it will not hold up to is sunlight. If the area where you are using it is covered its not a problem if it is exposed eventually it will start cracking. I screwed a small piece of it to the back deck of my boat for a bait prep station and within a year it was cracking and breaking apart. Just my 2 cents.
All in in all sounds like you have a good plan