Well, Atolm asked me to do this, and I'd been meaning to attempt a fullblown kitbash for a while. So I started on a TMP refit of the USS Christopher D Reyes today.
Here's where I started from.. very pretty.
Now that I had the mesh in Max.. I needed to decide whose parts to use. I settled on Khaliban's because I found it first on my HD.
I opened up the archive in a new directory, and then pulled the new parts into Max. I decided to start by removing the old TOS deflectors first (leaving the lit back to match a TMP style deflector) and then by refitting the nacelles, easiest to select and delete. Removed the top TOS nacelle, then the bottom, and then moved the new TMP nacelles into position. Took a render (trying a new 3 point lighting setup for renders at the same time)
Looks good so far.. so I decided to try replacing the saucer next.
Then moved the top of the saucer to match the forward positioning of the TOS version taking care not to stretch things too much (especially the registry)
I then removed the old impulse engines, and cloned the new ones once to give me two sets to match the TOS version..
Left this shot full sized so that you can also see another reason why I chose Khaliban's parts.. the level of detailing on his textures is just beautiful!
And after that, I started work on the new registries (which is where I am now)
Left to do, texture changes on the secondary hull (to update to TMP era), generate some color illumination maps to match the style on the new parts, and send it to Atolm when complete. He asked me to concetrate on this one, then to finish the TOS Excelsior (may raid this hull for the Excelsior because that secondary hull isn't behaving at all when it comes to texturing).