Heck Ken, we will make you a bodyman yet,what if genuine Visegrip brand clamps, a flipper (now that might have you thinking) and unknown brand of panel hammer on the cowl panel, (snapon would do) you are ready to go.
I would of thought it would of been easier to make the roof panel in one piece to safe the join in the middle? But I like what you have done sofar so I will just have to wait and watch and also learn from a master craftsman.