I have this model and have converted two of them and am on a third. One is a 5 tap keezer and the other two are ferm chambers. I have been planning on starting a thread re: the measurements for cuts and such this weekend once I get a chance.
Basically, I use a 1 X 8 tongue and groove board and cut good 45 degrees with a mider saw so as to assemble like a picture frame. That way the tongues and grooves line up and the tongue slips into the lid groove as well as the rubber skirt slips in real well to the board groove, not needing any glue, etc. If you get the measurements right, it's snug enough into the lid to hold it there without any attachment really, but I put in a couple L brackets just to be sure. Insulate how you want, mine is rigid foam insulation.
The stock hinges are definitely strong enough for that. On the keezer, I have my taps on the side, not the front, so I can't attest to more than that, but it's all good.
I put casters on mine so I can roll the whole chamber over to the brewhouse to fill the empty Sanke fermenter in place from the boil kettle--but aside from that my point is that you can't put it up against the wall unless you have it on casters or it is like 10 inches from the wall, so that's a consideration regarding placement.