It is designed around 1/24 4" wheel base bodies, but can be adjusted some. If it is built using the 4" wheelbase setup you shouldn't have to extend your drive lines. I am still deciding if I should offer the Blade SMC in a longer wheelbase version.
Thanks
Blade
as Ive said before I'm sure many people would love something to fit the 1/20 bodies.
the custom cuts would be nice but its not in the US