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No worries  :), not much has changed except I've added the engine texture and added a few little details, but I've been having a little break from painting recently. I've done everything now, just trying to work out the dreaded horizontal curve back lines  >:( ;D

Stripes wrapping across texture boundaries....one of the hardest things to do in livery painting for sure. :o

In case you've not seen some of these methods in the past.....

The method I use is to employ guides, utilize the UV map, and create 1/2 of the curve and then duplicate and mirror it to the other half (That solves many alignment issues in itself) :)

In the screenshot below...I have the UV layer set to Hard Light and 50% so I can see the paint under it.
https://imagizer.imageshack.com/img922/481/BPYsfT.jpg

Next I put a vertical guide on the exact pixel where the stripe leaves the side fuse texture and transitions to the bottom texture ...that is where you continue the stripe (of course).
(use the green lines on the UV layer as the end of the texture boundary...do NOT use the "painted" white area that appears to be the edge of the texture boundary...its not the boundary trust me)

Then I put a horizontal guide in the exact center of the bottom texture.

I then use the pen tool to draw 1/2 the stripe on the bottom, using the horizontal guide to snap the shape to.

Finally I duplicate the shape I created with the pen tool and mirror the new layer, bounding the pivot point on that same horizontal guide to create an exact mirror of the stripe on the other side.  ;)

Good luck with your stripes!  I know what you're facing to get them done correctly.  Any way you choose to do it...its not easy. ;)