I recently asked someone about this as I have one of those goofy Profi 0.8 radial mount with the carb offset 90°. I saw a Cyclon .049 (without pipe obviously) on Henry Nelson's 1/2A Proto a couple weeks ago. The crank centerline and cylinder should still be as the rules require. It looked like a Mouse fuselage with the cylinder on the side. Also pay attention to the fairing rule, can't extend beyond 1/4 chord, which is different than Mouse.

Thanks fellas

 

Anybody that protests a Cox reed engine in 1/2a proto would have to be the biggest weasle in CL speed.