I'm running Catia V5 R21 so it's cool to see someone else using Catia. The mouse navigation is unique and definitely takes some getting used to. If you've got a three button CAD mouse it's great.
I've modeled the front and rear hubs/bearings/studs and brakes rotors for another project I was working on. Nothing really complicated but I'd share the files if anyone wants them. No brake calipers or suspension components unfortunately.
It would be cool to build a full rolling chassis in 3D. I'm sure it's been done a few times already considering the stainless frames and custom suspension parts that are available. I've seen a few other screen grabs from engine swaps and it looks like there have been a few people who've done the rear engine cradle and the fiberglass pontoon. If I were ever to attempt an engine swap that is probably where I'd start.