Awesome work as ever, the Fire Hawks are (in my opinion) one of the more characterful Chapters from the Badab War books and this looks like a great intepretation of their colour scheme. I hesitate to ask (because you must get these requests all the time) but is there any chance of a tutorial on the colours used? I'm still using your original receipe for my Ultramarines, and damn fine it is too.
One other question, is that a freehand Chapter badge? If so how easy / difficult did you find doing it?
On the base issue, i actually think the one used is fine but difficult to make a firm recommendation based on one model.