Yes!! I'd order one in a heartbeat. Seriously.

I'd love to see a BK Butler Tube Driver clone. The 4-knob version with the externally-accessible bias adjustment mod. The Tube Driver is an important component of some of my favorite Eric Johnson and David Gilmour tones. 

Butler's back to making limited production runs at around US$425 a pop (with the bias adjust knob) <http://www.butleraudio.com/tubedriver.php>. I'm sure it's worth every penny to players who need to have the real thing.

Don't know what the legalities are, but I doubt a clone kit would put a significant dent in Butler's business. I believe (could be wrong) he even licensed the circuit to Ibanez for a while (the old '90's Tube King, NOT the new high-voltage version that just came out).