So the assembly continues.
Assembly of the rocket frame does require concentration and removal and clean up of each rail individually before assembling the part and then starting on the next one. The parts are different and need to be assembled in the correct order. The plastic is resistant to my normal Humbrol Liquid Poly.
I used one of the spare wheels from the Rubicon Allied Stowage set on two pieces of 0.30" square plastic rod for the cargo version. Be careful that you do not mount it too high otherwise it will interfere with the fitting of the load bed.