RE: Engine Mounting Advice
The motor pylon looks strong enough, but like you said, only one way to find out.
Not into nitro engines much, but I would think a 6 Oz tank on a .46 should give about 10 - 15 min of run time. I have a .61 with a 12 Oz tank that runs about 25 Min. Keep the pics coming and don't forget a vid of the first run.