[potentiality]

"Unless you made it really thin, lexan would probably be about as heavy as the plastic that's used on the RS bodies"

Is this based on experience? How are you drawing this conclusion?

Lets say for the sake of argument your right.

HOWEVER!

Your missing four other major factors for lexan.

A: You paint the inside, so paint doesnt scratch off.
B: It bends and reshapes itself unlike abs which will crack.
C: It has slightly more chemical resistance than abs.
D: Cheaper to make with a vacuum mold versus molded injection (hence lower price).

On the downside:
Not as much detail
Not as nearly as many moving parts


For bodies? You will have to look for aftermarket mini z ones from your LHS. I believe all the miniz bodies from Kyosho themselves are plastic. You can look for 1/24 bodies for mini x and abc dtm. But some of those come with the mounting holes predrilled, so watch out for that. That and you of course will have to make mounting posts on the xmod. Plus being a lightly bigger scale.