OK. I understand now. Feel free to send me more info when you can. As far as your questions:
1: Yes, I have a lightbox that I use often.
2: Right now, I don't travel much, but might if I ever built a mobile studio, a portable lightbox would be a must have.
3: That's a good size. I think about the size of a piece of paper is ideal. Most lightboxes are between $30 and $50, so somewhere in that range. It depends on the quality.