Some of the parts you're looking for must also be on that Fruehauf piece on the side. I've noticed it isn't detailed yet. Previous kit part suggestion: NEVERMIND. I can't make out the parts.
I see you've scratched the handles/steps on the one side. They look just as good that way. I can't figure out what part they might be either.
As you know, I made the Turbo laser using the most of donor parts, but it had some problem as the dimension compared to the prop and R/C function as well.
So, I decided to remake it and did re-measurement of all the dimension and remade all R/C function using the Clark-Model TK22 board like Jason Eaton. Thanks to Jason
Of course, all of these were inspired by Wasili and Jason's builder's guide.
My new Turbo Laser looks good IMHO for proper proportion and all R/C operating, even gun barrel fire effect and sounds.
The following is the Video clip.