Here are some of my favorite custom Willys wagons and some with better-than-average how-to documentation. I'm definately not a stock purist. I like wagons that have been repowered with an upgraded drivetrain and improved interiors.
This good looking wagon was built by Truck World and claimed 700 HP twin turbos running on propane. There used to be a nice writeup but as far as I can tell the article has been deleted.