That's a lot of good information. It looks like your V2 is very close in size to the H2. With the largest difference being 5mm, that's only 3/16 of an inch
(sorry I'm old school, never converted over) that's pretty close! Are they comparable in height also? I have a plain FP helmet that I was going to paint until I came to the realization of the differences of it compared to the H2. After finding that out I determined to make a good ROTJ, it would be best to go the H2 route instead of trying to make the other one work. Did you have any trouble sizing the stencils for the H2 ? I'm not set up very well to get my scaled properly...