I can see what your saying and nice to have a do it yourself and choice of axles
only one issue,
if memory serves me well, Toy R&P ratios come close at 5.79 compared to say 5.83 calmini ,
So the ring gear ratios would cause a slight issue,
Maybe one option is an extended sammy axle running the kick R&Ps but I doubt my front ARB would fit that housing with out some modification.
Given me some ideas .
PS the product looks great and its about time to for the old kick,,,,
I suppose I keep things fairly stock for ease of parts and changing..