I have this done on my car. The bonnet was cut by a panel beater, fixed up and painted. They just cut straight across at the front.
I have seen some cars from japan come over with it cut. Done by a home job also. It was all jaggered and bit dangerous but worked fine. You can't see that it's been cut unless you open the bonnet.
As for the grill it costs about $400 or so from Nissan. Just keep looking out for a secondhand one on these forums. They do come up every now and then