The body of the cabinet is together now, using a few drywall screws to hold the top and bottom to the sides, in addition to the glue.
Next will be the plain slab of plywood doors, easy by comparison - very easy. The top ended up not flat enough, because plywood never seems to be flat anymore, especially after sitting in the garage for several months, as this did. So, I had to do a lot of belt sanding to get it flat enough, but I still will need a layer of sponge pastic between the tank and the top to account for the slight non flatness.