The upside of resin is it should be pretty easy to tweak a hideous model to make it a little less ugly sister. I think having the extra nacelles underslung quite tightly on the saucer might improve it a little, or having v tails with 2 nacelles per side in the more usual position probably the best looking, if fluff inappropriate, solution.
As to overall design, I think the Orion stuff makes the Kzinti look elegent! :shock: