Welcome to the club! These things tend to multiply so don't worry, you're not alone!

The Jomurema body is for cars with 98mm wheelbases, so it won't really fit your 102mm LM unless you swap an MM motor mount or sand out the rear wheel well to make room for a tire that is going to be 4mm further back. Not sure how long the Jomurema body is going to be available, seems like they are going out of stock everywhere. It is a good option for a tough body though! My first Mini Z was the Toyota GT-One and it has been pretty tough, I think the rear wing came off the first day I had it but has stayed on since I glued it.

If you are already off the deep end go ahead and order a Mini96 RCP track so you can compete with us on the Mini 96 World Challenge! Nothing helped me to get better as a driver as much as having a track in my basement to practice on as often as I please.