I had thought of this idea, but didn't want to loose too much space in the
box due to corner blocks. I was going to try using those little plastic
blocks on the insode and screw outwards into the wood.

Any tips on what type of glue to use, I've got some of the white wood glue
in the green bottle (possibley PVA)

Maybe I'll just make the box a bit bigger, i'll have to make sure it'll fit
in the filling cabinet still.

Thanks