I understand what your saying with the hardwood beams being integrated into the fuse thorugh the firewall.
The hardwood beams stop at the firewall (angled down to provide the downthrust) on this design. The mounting plate sits on those with an angle cut in it ot provide right thrust.

The issue that started this was me wanting to 90 degree mount the motor so the muffler hangs out the bottom which makes this beam and mounting plate unusable. I was going to duplicate the down angle and maybe add a bit of right thrust as well... It's there for a reason on this design so I probably shouldn't mess with it to much. ( I feel like Brett Favre in the commercial buying the TV... indecision!

)