Brett gave me a hand this weekend. One of the funner tasks was getting the engine mount mounted. The top two holes are fairly well lined up but the bottom two holes needed some persuasion. We drilled all holes with a 23/64 drill bit and then used a 3/8 reamer to finish them off.
Placed a 2×4 against the fuselage and pulled the bottom of the mount into place. Drill. Repeat for the other side.
Brett drilled out the bottom two holes on the mount for the A model.