One other thing,

Make sure you have the right prop adapter before you make your motor mount, so you can account for the right clearance.
I tried a few different prop adapters, and I prefer the Graupner 6mm motor shaft with a 10mm prop shaft. I believe Steve also carries these.
This prop adapter comes with a threaded hole in the middle of the shaft that makes adding a spinner easy. I'm using the Tru Turn 3 3/8" (3 1/2" would be better) FAI spinner with a lightened back plate.

Pedro.