I've been working on a few truck mocs lately and finally got my hands on enough parts to rebuild the classic 6484 F1 Hauler set from 1995. I had a LEGO town poster with this on and used to stare at it for hours. The amount of functions they managed to cram in, plus the 6-wide body in 4-wide era gave it something of a mysterious charm I guess. 

Anyway, it was really fun to work on this one. All the functions are present and correct including the flashing lights and motorised winch, but the cab now seats both mechanics instead of leaving one of them to walk behind! 

I haven't modified the actual F1 car, I didn't have one of the black chassis pieces so had to POOP it. I'll probably revisit that at some point :)

Images below, and there's a short video showing the 9v functions. 

Cheers :)

I love the original and always wanted one as a kid!

Your mods are great but I think you should swap the steps and front axle, the wheels should be further forward.