So, again, new plan (I know, sorry!). I’m going to be using 3/4” Columbia Forest Products Purebond Birch Plywood for the substrate bin, using cinderblocks as the stand, and moving the bulkhead back to the very bottom of the front of the cage for drainage. There’ll still be 3-4” of a drainage layer separated from everything else with weed block fabric, so nothing can get down there to the standing water (which will be less than 3/4”, if that). It’s easier than engineering a properly strong stand and I don’t have to worry about fitting a drainage bucket underneath it, as well. I’ll also be using 1/4” Columbia Forest Products Purebond birch plywood for the two background sides. I’m doing this because the substrate will be at least 1/2 ton of weight, and I want a safety factor of 4. MDF isn’t nearly as strong as hardwood plywood. Also, I’d have to use exterior grade MDF, and I’m not comfortable with any chemicals that could be in there. This is definitely twice, if not three times or more, as much the cost of MDF, but for my peace of mind (extra strength and chemical-free), I think it’s worth it. Because of that budget hit, I’ll sadly have to redo the dimensions to 42” long by 30” wide by 60” tall of cham-usable space in the interior of the cage and an 18” deep substrate bin. That way I can use the short side of the plywood for the length of the cage and not have to buy as many sheets of plywood, saving some money. I’ll also be updating all SketchUp files with proper stand supports and and making a new one for this new cage plan, so anyone can use any of the previous designs if they want. I sadly won’t be able to start building until after the new year because I’ll be traveling a ton until then (and am hoping for a table saw for Christmas!). Thanks, again, and sorry!