Here's my Original Series Romulan Bird of Prey. The model started out as the ROM BOP from the 1976 AMT 3 Piece Ship Set then it was extremely modified to fix some glaring errors in the original kit.
The front Nacelle Bussard Collectors were chopped off and replaced with more accurate half spheres. The rear curve was increased and then the rear tail fin was modified accordingly. Dorsal panels were added, windows drilled out, a front disruptor was sculpted and the decals were replaced with JT graphics decals.