You're quite talented to say the least.

A

I have used acrylic rod for tube frames of racing cars.  Either acrylic or styrene sure is a lot easier than soldering brass tubing like I used to do.  My main trouble with acrylic is bending it for curved areas.  I find it hard to get uniform curves without melting parts of the piece I am bending.

A

Thought I would add this;

    I have bent Acrylic rod successfully using hot water ( Boiling ) .It softens it enough to let you put it in a jig Before it gets firm again. This with NO springback ! It's tricky though .Some I have had, actually turned into an oval mess . I guess you have to be sure where it's made .

Graham;

      You are doing incredible work here. Question. Do you have a living Scale driver in the wings? Otherwise whose gonna push the pedal to engage those Beautimus brakes you've made?

       I did do a working hydraulic brake system in 1/8th scale but it took four tries to get it right .It did work through the master cylinder too. At the time I had a jewelers lathe.No Gotsa dat now !

Again, that's awesome!!! And I know what you mean about trying to build something and the blueprints aren't right in the first place!