I love your plan, pretty much how i do it, but i like to use spray polyester. I like blocking the panels into each other (doors qtrs, fenders) then carfefully take it apart for paint . It gives you really nice body lines and super flat flow from panel to panel
Haven't any experience with poly primer yet, but after the multiple rounds on the quarter panels with regular poly filler on the fenders and quarters to get them straight, I can see now that maybe poly primer would have got me where I wanted to be, sooner/faster.
I'm probably an odd duck in that I'm totally comfortable with old stuff hardly anyone is interested in like lead/body solder and single stage paint, but have not tried poly primer.
