Very nice!
I’m no expert on skins, but what I do to get close to aligning things is to paint a series of different brightly colored short+narrow stripes (think yellow-orange-neon green, repeat as necessary) along the edges to be mated. Separation of stripes depends on size of colored areas...do a couple areas, check the model viewer, you’ll see “ok, the dark green area’s edge is about 1/3rd between the second yellow+orange lines” (sometimes I’ll mark the locations on an edge of a paper, to record the exact proportions). Go back to the paint program, adjust colored area location aaccordingly and proceed to next colored edge.
That’s as far as I got before being distracted by surface details (rivets, panel lines) which the SU25T template doesn’t have, so I’m making a template layer with them.