Looks pretty good so far ,i get it its just in mockup stages, as usual guys on here dont get it ,if youre building for accuarcy or just doing it the way you want, enjoy.
You can do it his way,or measure the middle of the front wheelwell to the middle of the rear wheelwell, thats your measurement then take the difference and cut that off the chassis, good luck.
Ive built many willys but never a pro street,using the street rod version ,after 2 months this is where im at ,alot of scratch building and modifcations to make this a true pro street, the street rod version is more like a mild prostreet car.