Here is my kit bash based of the Callisto class starship (https://fasaststcs.com/index.php/thefleets/united-federation-of-planets/star-fleet/callisto-class-viii-frigate/), using Captain Mojo's Parts Kits.

It's scaled to 1/3788 but it should be easy enough to re-scale in the slicer of your choice.

I made it in OrcaSlicer.