Hi,
I am forever fly tweak fly tweak until the demarcations all align, where they cross skin mapping borders between the panels.
Actually I am using the 3D window, the big one, one stage before flying, to suss joints.
e.g. Me109E stbd wing, brush tool soft edge a diagonal line for the rlm71 splinter and fly, and it steps at slat and again at leading edge mask panels.

Can I open the Me109E-1 3D model into a prog, and I recall Pshop allows painting onto 3D, and see the skin as if by magic have the line appear. I am sure gamers skinners do it this way nowadays. Saves all that sussing of panel edges using panelFinder and many hours working to pixel accuracy to avoid the Z joints in demarcation lines.

Next stage is mottling, so fiddling those to abutt at skin panel joints will be even worse, the 3D method hoped for will be great.

BOBC