Marek has pretty much covered it, but a couple of extra observations/assumptions.
Whilst electric can give you high torque, it’s not infinite. The motor Marek has, peaks at about 20Nm compared to a GX200’s 13Nm. Of course, given how bogged down our engines get when coming out of corners, it’s questionable how often we achieve peak torque from the gassers - the electric motor should perform better in these circumstances.
The current drawn ramps up very quickly for peak torque, so Marek’s motor draws 100A for 20Nm. Our research so far says that the safe peak current for the batteries we can get is about 2C - ie twice the capacity of the battery. So, for 100A, Marek will need 50Ah batteries. This is starting to create another design constraint, because 48V, 50Ah batteries will add significant weight and size, not to mention cost.
One aspect of this is to apply engineering principles and then compare them to real life performance. It’s not as direct a route as copying what someone else has done, but it’s potentially a much richer learning route. All part of the fun!