Angled wall giving me problems

I’m trying to draw a box for holding some lights on a 4 wheeler. I’ve got the basic shape but I haven’t been able to get to a solid object. I think the angled side wall is causing problems in trying to join with the bottom. And because it’s all inside the box I’m having trouble seeing how I might make corrections. Any suggestions would be very much appreciated.
John’s light and switch box.skp (57.6 KB)

You have a walls without any thickness.

I´ll fix it for you.

John’s light and switch box.skp (131.9 KB)

Thanks for the help. It looks like you operated in xray mode to make the corrections. Were my errors caused by the angled wall?

It depends on how you modeled it.