I think "kitbash" is selling Bill's work rather short.
Nah, there's nothing dismissive in the term. it's a widely-recognized colloquialism, (as I know you know) referring to models based partly or largely on preexisting kits and found objects. Trek has used quite a number of kitbashes on screen over the decades, sometimes as display models on set but often as full-scale spacecraft. And some of them were quite beautiful and became well-known, like the Stargazer. Most of the fleet at Wolf Whatzitznumber were kitbashes. And so on. The Phoenix in "The Wounded" is more or less a Galaxy kitbash.
Bill did quite a bit of fine custom work on the Shangri-la, which is why I described it as sophisticated and well-done. The entire secondary hull, or virtually all of it, is custom-crafted parts.
That said, there's a difference in scope between "Design the best Starfleet ship you can" and "Design the best Starfleet ship you can using mostly parts at hand." For the latter you can't do better than Bill Krause's
several designs over the years; indeed, they're superior to a lot of the screen-used models I singled out above. But if one were to mistakenly assume as I did that the Titan-A was an "original" design, well, it comes across as far too derivative to be first-rate.
And, BTW, the original Shangri-la is better looking and more coherent than the TNG-ized Titan version.