That's an elegant and smart piece of engineering. Great video - watched it all.
I've built and accurized 3 MPC kits. This would be a nice add-on. I fear the popularity of newer kits such as Fine Molds, Revell and now Bandai might decrease the potential market for this as far as MPC is concerned but as you said, it could be adapted for other kits.
Regardless, fantastic work.