I have a four stroke Huasheng 142f engine to mount onto a GT2A frame. The mount I have is the "heavy duty" one bikeberry sells, and the angles do not match the angles of the down tube and the seat tube. The front matches the down tube, but the back is way different than the seat tube since I want it level. How have some of you mounted these engines to these frames? Has anyone used the aluminum mount for the huasheng that Phantombikes sells? I'm just about ready to start my build, and I really want the mount level and to fit flush with the frame. Suggestions?