I'm on the fence about running fiberglass fenders, for the short term the stock fenders will get cut to clear and see how much of them are left. Roadrunner seems to make the highest clearance without going one piece but even they will have to be reworked quite a bit to work with 40s pushed 4-6in forwards.
The rear will likely get rub rails to help keep the windows intact and I'm leaning towards making fiberglass flares from scratch to mimic the stock profile but with ample tire clearance. This whole build started with a powerpoint mockup and I've been massaging it as I go.