@flandish

If your terrain is irregular along a given panel, you might have to straighten it out a bit so you get level tops without ground interference at bottom anywhere.

If you have two opposing slopes forming a ‘V’ (valley)… well, theoretically that join is possible. :)

@pageflight

The best way to handle this is by clamping the side that doesn’t take a driver.

Bob Rozaieski used to have a good vid on this, which seems offline now. But here is a similar idea.

https://youtu.be/xE0yh4tV1WI

@nice

Nice box.

Looks like it’s a carcass and panels build. So the corners/feet are the four stiles of the box carcass with mitred panel grooves along their length. (The walls of the grooves would need to be mitred but not the bottoms of the grooves; they only need to be sufficiently deep, thus the stiles sufficiently thick.) Likewise the rails would have mitred joins with the stiles, plus right angle panel grooves on the bottom rails

That’s how I would try it, anyway. Not an easy one.