This looks like it could be the design for a Federation carrier (the fighters would launch, be stored, and be fixed in the lower cylindrical area.) Great work.
Very cool! I did a kitbash with the help of "Spaceships in Fact & Fantasy" years ago (the original release AMT kit) and would have love to have this image way back when!! LOL
I still have a very very battered copy of that. Originally got it to help me make a mig into the eldorado but have tried virtually all the projects over the years.