The foggyness is on the outside of the glass? Not following what you are saying. Could be the inner and outer glass separating from the plastic liner in the middle.
I made some out of quality laminated birch plywood, I keep them stored flat on a shelf when not in use. They work great.
I used some folded up poly sheeting to drive the tires onto to act as a tire plates, which worked very well.
I finally broke down and got one of these for doing my bi-annual trans fluid flush. I already have the vacuum extractor to empty the pan. I am sick of fighting a funnel in the fill tube to fill back up. This works good.
https://www.amazon.com/dp/B0D7CBL91P/
I should have mentioned before you stabbed the motor back in. You want to replace those plastic heater hose connectors on the firewall. They are known to break and dump all your coolant out before you even notice something is wrong. Use genuine GM plastic connectors. Or Dorman now makes metal...