The problem with a really good custom is that you'll spend 3-4 times what a HT Han Bespin will cost you. I'd assume all-up (head, paint, trackable shipping to and fro) DrX's head above would have easily cost more than a shipped HT fig.
Then there's the possibility you spend all that, go to the time/effort of putting it all together, then a few months later HT pulls a Luke Bespin on you: the years-lost fig suddenly previews and goes up for PO.
It's the key problem of HT's near-total lack of engagement with its collectors all along - they constantly do stuff that makes no sense (they preview 3 different power droids, actually releasing one, but no Han Besp?) and there's no way to predict it.
Even SSC at one time had a "Ask Sideshow" avenue to ask them questions (even if some of what they said they would make they didn't, and vice versa.)