I would go for an aluminum or carbonfiber (expensive) chassis. Just buy sheets of the stuff and cut it with a saw (I use a wet saw).
I don't have a saw handy, nor would my mom let me use one (I'm not very responsible)
What you need is a dad that knows what he's doing with his tools XDthank god I have oneYeah, Zipdragon has some good advice on parts and stuff. Look through one of the stickied threads somewhere in this section, gives some good stuffHey, who knows, maybe we'll fight someday XD
if you cant do any work yourself its not a problem if you have money... there is bound to be plenty of metal workers/ machiners around... Wont necessarily be the cheapest way but it is a way none the less.