Hi Andy,
Your install looks great. Building from a kit or plans gives you many options for the E system. You can make easy hatches, better cooling, cowl flaps, etc. I look forward to seeing your progress.
RE: Your motor removal. You may want to make your rear bulkhead, that the rear bearing is in, removable. You can make vertical ply rails on each side and just slide it out via the top or bottom hatch after you take the front mount screws out of the front of the motor. It may not be needed, but a small screw should be enough to hold it from moving if it is a tight fit. There is no fore and aft force on it, so it won't take much.
If it is possible, you may want to make a "quick release" top hatch to access the battery on every flight. This makes it very convenient and prevents mucking up the lines flipping the plane just before each flight. And then also make the standard bottom hatch to get at everything else.