Hood,
If you do use sheet metal or alum
I suggest the following. See pic
My end panel , back , and front all have the 1" 90 degree corner. Won't get no leaks that way. they overlap each other.
The bottom of the end panel has a 1" x90 in and another 1" x 45 down. 2 latches near the top hold the end panels in place.
You can remove the end panels for cleaning out, or if you get a long part, or to pick up your vise if you drop it.
Or, if you moved closer, I could set you up.
Ed