The roof line looks good. Try moving your B pillar forward (or adding one if it's 4 seater) and angle your door bar up to the back. Just my $.02 (not that you wanted it ;D )
ive had alot goin on in the last few mounths my four seater plans have changed i bought my wife and kids rzr 4 so now i have no need to build a four seater here is the start of my new frame design ....what you guys think...