Jon,
I just finished fitting a YS 110 "A-type" Hydemount to my Q2. I remembered to measure the position of the motor.

With the cowl all lined up to match the lines of the fuselage, the center came out as follows.

Vertical Center-line 2-1/16" from the right hand side.

Horizontal Center-line is 2-19/32" from the bottom.

Interestingly enough the Hydemount spaced the engine drive washer out perfectly at 5-3/8" from the fire wall.

To answer other questions. It looks strong enough but I still added some lite-ply in eitehr side of the wing-dowel-former and I cut into the canopy floor to allow for a center mounted pressurized tank.

Regards,

Eric.