Thats a really good idea! Most have only 2 bolts holding the starter in also. That 3rd bolt around a stock Kmember can be a pain!
So lets look at this closer. By doing this cut away youll be eliminating a fastener....which is covered by the other 2 fasteners, right. We cool their! Youll also be eliminating a hub centric location that keeps the starter located exactly were it should be and worst of all, the section removed is the main section that would keep the starter from pushing itself away from the flywheel.