You have every right to brag about this piece! It is really nice.
Meflicks advice is spot on! So I will repeat some of it.
Regarding Intarsia tips and techniques the intarsia section may get you more specific guidance.
That said, for fit Cutting precision is crucial, be consistent, as crazy as it may sound I try to split the line to the outside, trying to minimize what you lose with the blade Kerf.
I also try to use the smallest thinnest blade I can get away with. An example the Pegas MGT 3 12.4 TPI cuts a kerf .014" so on your wing where there are 11 pieces, depending on how you cut it. If segmentation 5 cuts remove .07" of material. So it is easy to see that cutting to minimize the kerf loss on a large piece becomes critical. I do use the MG 1R kerf .0114 so the same five cuts remove .057