Good lighting, a comfortable chair and a radio/cd/mp3 player. Dremel is nice. Clear plasitc rules, at least 1 steel rule and one long rule (4'+). Possibly a soldering iron for linkages. I find painters tape handy, not just for paint masking, but for masking areas you want to protect while sanding or for general hanger rash protection. Later on, you might consider tools for hinging, depending on the type of hinges you use. Also things like covering iron, cg tool incident meter, throw guage. Save your fingers, get a tee pin tool to set and pull tee pins. If you keep building, there are tons more tools, but that's another story.

Scott