You're welcome, Tina. :) Yah, that Craftsman case sounds too big and heavy to take in.
I just fill one of my frosted Plano fishing boxes with bracelets and such (it's 14"x9"). It's the type with four long trays, that come with small dividers you slide in to make separate compartments... I think they're about $4 around here. I don't use any of the dividers and I place bubble-wrap on the bottom of the trays with scotchtape. Then I lay all the jewelry for each tray onto a big piece of tissue paper and roll it up into a cylinder that fits into the tray. It's nice to have everything rolled up into a larger piece of tissue because when the gallery opens it to look at the jewelry, it's large enuff so that they can spread out all the jewelry as they look at each piece and it'll also be protected from clanking on the top of their glass display cases and possibly cracking a crystal.
After the plano box is filled, I'll take another piece of real pretty tissue paper (right now I have some fantastic red, white and blue stars) to lay over the top of everything, then I just tuck it in a little bit around the edges... and sometimes I'll also barely spray the tissue paper with a gentle, sweet cologne, like Vanilla or Frescia (sp?), so when I open the box at the gallery the air is gently perfumed. The gallery really liked that last time and you know, aroma therapy plays a big part in our senses.
Your briefcase/pistol case and foam idea sounds excellent also! I love some of my husband's pistol cases... they're lightweight to carry easily and usually have a very comfortable handle. Just remember the pretty tissue paper and all will be well... remember, they're looking at your end product, not the box you carry it in. :)