I'm not a huge fan of sized-down models for testing garment patterns, but sometimes, well, sometimes it is not the worst idea. So it happened today - and the result is, I'd say, not that bad:
I have managed to invert sides (or would need to turn it inside out now), but overall, there's been a few insights, especially regarding the braguette. So... once all the other questions are solved, I might have a better idea of how to attach it!
(Still to crack: The "how to place it on fabric and so on" riddle.)