The AMT RBOP was one of the most extensive modification projects I ever undertook. So many things to fix to make it even close to accurate to the miniature. I think I spent about 6 months working on it. Of course, I did add my own lighting system that required drilling and filing out all the square and round windows before framing them with brass tubing, just like the studio model:
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Romulan Bird of Prey by AMT WIP by Steve J, on Flickr
One thing I added that the studio model didn't have was a shuttle bay and tiny scoutship:
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Romulan Bird-of-Prey by Steve J, on Flickr
Lots of work but worth the effort.