Initially, I wanted an MST RMX-M S Pro kit to run special m-size RC bodies, such as Spice RC Suzuki Cappuccino, HPI Datsun 510, Tamiya S13, etc. I've been using MST suspension on many chassis and liked how adjustable RMX-M suspension are. However, stock RMX-M only allows one or a couple wheelbase options unless you buy additional chassis plates. 
So, I decided to design a 3Racing Sakura D4 adjustable m-chassis conversion with extra and saved parts. The conversion kit will also use RMX-M suspension since I want to use them. 
I know, I have too many parts 
Note: I try to use simple English for better translation