the nacelles appear to advanced for the saucer. You have nearly tng era nacelles on a super thick saucer which looks pre-tos. My advice would be to thin the main strut that attaches everything to the saucer, and cut the saucer thickness too a third for what it is now. Perhaps having black busssards with the ribbing (like the excelcior or tmp nacelles) instead of tng style too, but you'd have a good early version of the cheyenne class.