Mostly used what was in the box. Split the trailing arms from the driveshaft tube and made new mounting points for them on the chassis, cut the tube off and will make a new driveshaft.
Using the stock front axel and spring. Again, making new arms with mounting tabs added to the frame. Added the second exhaust pipes from copper wire and a piece of sprue.
I think it doesn't look too bad for a quick and dirty chassis.
, , and another mockup with the assembled body/fender assembly sitting on the chassis with the engine installed.