In article , "jg"
says...
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.

You can do it on the outside instead if you want then you'll only
lose a bit off the length, and the inside will be nice and square
:-)
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Any tips on what type of glue to use, I've got some of the white wood glue
in the green bottle (possibley PVA)

That'll do.