Yea I can do a closed bay version. Just some info on the shuttle as MajorRacal commented it might be too big. I measured it in game comparing to the wing span of the V-4. I was able to put 16 and 1/2 shuttles touching end to end lengthwise along the wingspan. Since the wingspan is 195 meters, this makes the shuttle length 11.8 meters. Anyone have an idea what an average shuttle length in TOS era was? I want to get things as authentic as possible so I appeciate comments like MajorRacal made and Mariner did earlier about using square nacels. The ship looks much better for it.
The shuttle is actually modeled after the P-12 cutter as seen in this link.
P-12 This P-12 is actually 54 meters in length. Making it more of a PF fighter I imagine. The length of the V4 is only 80 meters. So obviously it couldn't carry a P-12. So when I release the P-12, I will scale one at 54 meters and the other the same size as the stock shuttle in SFC3(I'm assuming those will be 2 different sizes, but maybe not). I also have 2 versions of nacells for it so I will include them both. I actually have not finished texturing it yet. Though for inside the bay it really didn't need any detail, but the 54 meter one will