Martin
I must congratulate you on the work carried out on those guards simply.... GOOD WORK!
If I might say so
in order to make the wheel arch and the return a bit quicker and better, .. use the method... (if you like) that I have used on dvd when making the Monaro wheel arch.
Simply use a small blocking hammer and block the edge of the return ...been the top line on your wheel arch then with a rod flipper form the return down on a sand bag keep stretching the lower section of the wheel arch to stop the panel getting too round, once that is done, block again the lower line on your wheel arch till the lower lip of the guard starts to go over keep your eye out for the over all shape and stretch that lower lip while it's going around .With a square dolly or bar of the same width between the two lines finish off the wheel arch
Peter