[Ecurie Martini]

Carver sent me a photo of the shell as it is now with an 050 inside - it will be close. There are a series of dimensions to be "stacked" to determine O/A width:

Length of motor over endbell and bearing
width of wheel over boss X 2
width of spur gear over boss
width of pinion? depends on the above.

If the "stack" is too wide, there are two possibilities in the sidewinder configuration that are, incidentally, poles apart (no pun intended)

An 030 motor solves the width problem but sacrifices torque, braking and, possibly reliability
A standard FC 130 can with end bell drive can be effectively "shorter" than an 050 because  a recess can be cut into the plastic end bell to accommodate the hub of the spur gear. - potential issues - an FC 130 is 15.6 mm high.  Based on 19mm tire diameter, this leaves only 1.7 mm ground clearance OK for my local rules ( 3/64") but I don't know about other venues.

Wheels and gears in transit - it's now up to the post.

EM