Recently I procured 3 Ravenstar 1400 scale K'tingas from a friend (a very awesome deal) and I decided to make one of them into a Romulan V11 Stormbird based off of old FASA schematics shown HERE
I started by building custom nacelles based off the diagrams out of various styrene shapes and 2 nacelle struts form the old 3 piece starship set. I sanded off the K'tinga wing pattern on the top and bottom of the model and I designed a custom decal sheet in Adobe Illustrator for the feather pattern that fits over it.
Dorsal view, primed with feather pattern shaved off:
Scratch built Nacelle:
The Illustrated Custom decals:
Decal test fit of the Dorsal Wing Patterns:
Decal test fit of the nacelle grill: