Got a few revisions and additions done today. I added the bridge and impulse engines to both. I added the hanger to the TMP. I added the deflector dish hardware spaces. I revised the warp drive deuterium input. I found that the box at the bottom of the TMP shaft is labeled matter/antimatter mix chamber. I added the main engine room to the TOS Enterprise and revised the pipes. I found the perfect identifier for that item. It is the auxilary power reactor. I added a second one at the back of the saucer and a mini-engine room (on deck 6 not 7 and if you don't look too much at the ceiling, it would fit there). I added the same type of structures on the TMP Enterprise. I placed it right below the horizontal shaft because I though that the shaft supports would make an excellent power bleed mechanism to pull power from the reaction. Except at the top and bottom, that is they only place the shaft touches anything before heading up the pylons.
In any case, here are the latest edits. Enjoy.
And where the TOS Enterprise has two distinct engine rooms, the TMP Enterprise has the vertical shaft area where different engineering operations can be conducted at different levels making specific rooms unnecessary.
In any case, here are the latest edits. Enjoy.
And where the TOS Enterprise has two distinct engine rooms, the TMP Enterprise has the vertical shaft area where different engineering operations can be conducted at different levels making specific rooms unnecessary.
My head cannon keeps the full length pipes as intended by Matt Jeffries. Designing a force perspective item and then saying that it isn't but it only looks that way makes no sense.
I guess I'm in the camp that won't give up on the full size pipes. 
I'm cramming 24 foot shuttles into my internals come hell or high water.
After getting destroyed, maybe its replacements weren't all the same size, even though the same varying scaled models (shuttlebay mini, space scene model, external stage prop, internal stage set) were used for all of them.