Corbomite: I was guessing somewhere between 15 - 20 ... sooo I think I will stick with that. Not all of the decks will be extruded ... BUT .. I need to make allowances for the textures and those decks that ARE extruded to be somewhat proportionate (if that makes sense).
Adam: I still have the original frame that I was working off of that is closer to the Taldren build. I the first pictures I posted. If needed I can save that under the "Shadowhawk II" and I will begin a separate file for this newer "hybrid" "Shadowhawk III".
For now the Shadowhawk III will simply have some more detail (ie: a few places on the bulkhead to be extruded ... and hull plating panels raised on the body )
Shadowhawk pre TNG: Shadowhawk IV . If we develop this one right for that time period the nacelles should be changed a bit. Currently the Shadowhawk II and III reflect a more bulky or "squared" shapes to reflect the designs of that time. Pre-TNG IMHO might have sleeker designs of sorts. The bulkhead would be a bit sleeker (though not too much ). The body would have a slightly different type of hull plating as well.
Hmmm.... I think I will hand sketch a few types of hull plating ... scan them in and post later this evening and see what you guys think. As I said earlier this is my first attempt at a Romulan ANYTHING !! (sorry ... looks like you guys are the guinea pigs ! )