Re: Ray's TAS shuttlecraft...
I've been thinking about a TAS design that is only glimpsed in the one panning shot we have of the flight deck in the episode "Mudd's Passion." It's something of an ovoid shaped craft and I've been musing whether I could turn this into another class of auxiliary (shuttlecraft): a cargo shuttle. I'm going to start sketching and see what I can come up with.
There's a possibility here that has never been explored: a Federation fighter/probe craft. This shape, taken in a smaller scale than what you suggest, would lend itself beautifully to a kind of TOS version of the NX-Alpha prototype, folding warp wings and all.
"The way that you wander is the way that you choose. / The day that you tarry is the day that you lose. / Sunshine or thunder, a man will always wonder / Where the fair wind blows ..."
-- Lyrics, Jeremiah Johnson's theme.