ORIGINAL: da Rock
Strip ailerons aren't the design of choice if you're wanting the plane to hover or 3D. But you'll see for yourself I'm sure.
I'd say your choice of engines is good. Your model's weight is going to work better with more, not less horsepower. But don't expect to have really good 3D. The weight loading is working against you as are the thin ailerons. There is a reason 3D models have ailerons that're 1/4 to 1/3 the wing area.
Like he said, a 3D plane this is NOT.
The Four Stroke .70 is not much different in weight to a 2 Stroke .46 often used for the plane, so it will not be problematic.
If you are flying onto or off of grass, omit the wheel pants and put on larger wheels.
I have one Ultimate 40 where I've put on 2.75" or 3" foam wheels.
It looks a bit like a bush plane with wheels of this size, but it lands well on grass.
You do want to hold up elevator whenever you are taxing around.