Chris is a good source. He has built several good electric airplanes.
I have a couple observations. First, if you do the modification from an existing acoustic-airplane design yourself, when you calculate CG, assume that it will be an inch or so forward of the original CG. Second, you are no longer constrained to have engine mounts glued to the fuselage side, so you can make the fuselage wider. This enables it to be lighter for a given strength or rigidity and allows more room for the electrickery and cooling thereof.