No, it's not. Ask as many questions as you need answers for.
I would either quilt the pinwheels in the ditch or echo quilt them (1/4" inside each piece).
I can't help you on the binding, I've never done the inside corner thingy.
Look at the post (by Bearisgray) that just came on about binding inside corners. Scroll down and members have posted two different links to show how to do it.