ArtMetal

Hello all, I've lurked here for awhile but now that I've made a couple simple things I thought I'd get more involved.

 But first I have a question/problem.  I want to form a small box from copper, maybe 4" x 6" at the base and about 4-5" tall.  It may sound a little odd, but it actually doesn't need a bottom - just the top and 4 sides.

I was hoping someone here could give me a basic idea of what to do or point me to a website or book with the info.  I looked around here a bit, on Instructables, and using Google but didn't find much.

I considered folding the sides from 1 piece and riveting the seam (all 4 corners actually for looks), and then bending a "skirt" around another piece and riveting it on as the top.  My big issue with this is how to form the rivets for the top, as they will be inside the box and pretty dang hard to hammer on.

 Should I just braze or solder the seams?  What if I want a nice hand-rivet look at the seems, is there an easy way to pre-form one side of a rivet?