RE: PROFI RAMBLER .049
That should do nicely...!
I would consider a little dihedral. I used some with the old P51 SWR.
What I didn't realize at the time was how much "down thrust" the high thrust line with an inverted engine / low wing combo would effect the launches. The plane will dive for the ground no matter how you try to release it. A .32 powered version acted exactly the same way.
You've got the right idea with keeping the thrust line close to the wing. It also might be good for a couple more MPHs..?
Another idea from the School of Hard Knocks would be to run a lanyard from a wing mount bolt to the engine. Some C/L cable with a slip knot could wrap around the cylinder. Just to confine the debris field a little bit....if that day ever comes.