So I finally relocated my battery few days ago to the trunk, I was also able to reuse the existing battery tray in the engine bay and mounted it in the rear most corner (usually where the regular E36's have their batteries. The rear side panel clips needed some attention so JB weld plastic bonder to the rescue!
I will do some more maintenance before the supercharger goes in but not going to spend more than a few hours on it every other day.
I also added a custom DIY xbrace any I made, that anyone can do. It still needs to be painted...will have separate topic on the xbrace in the other forum.
Adding some pictures below.