Shaun,
Thanks for the tips. Yes, when I installed the metal hatches, the support posts were cut off. I was thinking of gluing in a large magnet to the upper hull in the rear corners and then using a metal L-bracket in the lower hull. Then, gluing magnets to front and middle posts. But, I like your idea of screwing them in better.
I'm not sure that I'm following you here: "unfortunately that will only hold the body down, to hold it in place the struts behind the driver and radio operators hatches need to be drilled out to accept 3mm rod which when the bottom of the struts in the hull are filled sit unglued erect and fitting into the struts in the body, to fit top to bottom, with the two front hatches open you can then align the rods it sounds complicated but it is easy and much better than Heng Long's method" Do you have any pictures or a sample build thread? I would have thought that for the front I can just use those countersunk magnets to screw to upper and lower hull posts and come together that way.
Are these what you mean by R-clips?
http://www.unispares.com/rclips.html I grew up calling these "cotter pins". Don't know why...
I will be installing metal road wheels. I had HennTec tweak them a bit. So, now they have a solid steel axle and brass bushings. Someone else in Germany will do something similar with bearings in the wheels. I didn't see that until after I had HennTec's work already. I have the metal supports for the return rollers. But, for now, I'll keep the HL plastic return rollers. I really want AsiaTam to make and re-release their metal return rollers with rubber tires.

They are better built than the Taigen wheels. The metal supports came steel axles and C-clips. I'm not sure how they are supposed to be used, though. There weren't any grooves in the axles that I expected to be there to properly place the C-clips. Without grooves, it seems that the clips would just slide down the shaft over time. Thoughts?