Did a few not-so-minor changes to my f1, now 4wd, 4ws utilising a small jet engine instead of wings for downforce…
www.geocities.com/alicopey158/f1b.html
still to do most of the details like the front wheel mount and suspension.
c&c welcome… 
Edit: fine, no replies.
Updated: see https://blenderartists.org/forum/viewtopic.php?t=11361
Comments/crits still welcom, it’s not too late to change stuff.