Paul, I think one of the top priority's you have to do at this stage of your build is to "sit" in the car and play "driving".
I know this sound stupid but is an important moment.
Firstly, you can tell if the car "fits", leg room, peddles, steering wheel, seat position ect.
Secondly, It makes you feel so good at what you've done so far and bleeds inspiration to finish the car
