When I installed PF-150 and PF-137 the result was that the witdh of the cabin frame and the firewall was not the same. (MY MISTAKE). So I flipped the 2 angle pieces over and redrilled to the right dimensions. I ended up with 2 holes on each corners right where the engine mount holes should be. I decided after talking to Mike at Bushcaddy that I will replace both pieces PF-150 and 137. Looks like a waste of time to some people, but I want the engine mount to be fixed correctly.
I also positionned and drilled the 2 ailerons lower pulleys in a position that the cable won't interfere with the rudder cable.