two things...

1. I think it'd be a tight fit to get those screws in on the windshield. There's very little material behind the windshield to screw into, it'd be really hard to get it right, and without splitting the fuse sides. Personal call...

2. The other way around the protruding screws would be to mount the engine mount and mark where the screws protrude, then saw them off at the line so you're not trying to saw inside the plane. Just gonna be a PITA to get a good hold on the screws while trying to saw them [:@]