I am familiar with the old ABS Fountain with its submerged drive. It is large (42") but relatively lightweight - in its original configuration. What motor are you planning on using? Just stating the Kv does not tell us the power of the motor. For example, a 380 motor would be far too small for that hull. A 580 or larger motor is more appropriate, but what do you expect from the boat in terms of speed, run time, etc.?
A 50 amp ESC is way too small, particularly if you expect much speed from the boat. A 2100 kV motor is too high for a submerged drive and is almost certain to over-stress the ESC, and 4S is marginal power for this hull.
The MRP shafts were fitted with Octura plastic props as I recall, in a standard 1/8" (0.125") size. I wonder if a previous owner has replaced the original shaft with another? You will have a hard time finding any props to fit a 3.5mm shaft, better to replace the shaft with a 1/8" one.
Give us all the specifics possible and we'll try to help.
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