Another way to go would be to get a quality rotary tool like the Rotozip Revolution - 5 amps and you can get accessories to make into plunge router, straight edge, circle cutter, grinder, flex shaft, etc. much better than dremel. I've used mine to cut wood, lexan, even metal pipe and pvc. Best tool I own. They are expensive, but very very handy.
Also, isn't a real jigsaw a table-top saw with a small blade that vibrates up and down? that wouldn't be too good to make a whole cab with. Even a bandsaw would be tough to use for that. Though a reciprocating or circular saw could do the trick. I guess most of us have a few of each.