Don't just lift the nose. If you are going to replace the wheels (which I would suggest, especially since you suggest that you are flying off of grass), replace them all with some 3 1/4 inchers. They will roll much easier over the grass. Lifting just the nose of the plane will give you fits trying to keep it straight on the runway--basically nullifying all that is benificial about a trike setup. P-factor will come back into play, and the plane will be a bit squirly on the runway. Just lift the whole thing up and you will be fine. Also, think about the 3 bladed prop. I've had to do this with twins (because of clearance from the nacelles to the fuse), and also on a sea plane that I'm currently building (because of clearance from the engine pod to the fuse). Three blade props really are nice! And, as an added plus, it will help you slow the plane down for landings much easier!