Or you could go real low?
Check out this deer and race car gif.
Deer gets hit by race car | Best Funny Gifs and Animated Gifs Updated Daily - Gif Bin
I think for safety, perhaps a roll bar down the center of your windshield to prevent the deer from coming into the cabin is best.
Perhaps another bar or two protecting your radiator so that you can get home from out in the boonies.
The front corners are going to have to be sacrificial for aerodynamics sake, that is unless you can find some foil shaped or shallow elliptical (oval) shaped tubing.
Square and round tubing causes huge drag profiles.