I am 6' 1" 260lbs. and fit with room to spare. No tilt wheel but it is at a good angle. Leg room is good but could use a little more space between the seat and the peddles. Find one and sit in it to make sure.
He has a belly at 6'7" and only 300lbs? I would have thought that to be a pretty solid belly-less weight.I have a buddy who is 6'7" and a little over 300. He was all set to get a Pioneer until he sat in one. His belly rubbed the wheel.
Like Rich said, you really need to sit in one before you dedicate to it.