I too own a DW - I believe mine is possibly the second or third one built. A few comments if I may.
I have seen the drawings Roger refers to above. I can't speak to the date they were created as I was physically not there when they were, but they do show several iterations of the bodystyle in development. Whether Alembic or Roger is the architect of the bodystyle is a matter between him and Alembic, so I will stay out of it. I will say it is a very beautiful design, and more comfortable to play, sitting and standing, than one would think.
Roger is correct when he states that Alembic electronics, as configured in the Signature Electronics, are primarily designed to subtract frequencies rather than boost (unless, of course, you add the boost switches as on my Europa). I don't personally view this as a negative however, and I find the set up very versatile. I can get Jaco like tones out of mine, as well as Entwistle, Clarke, etc. Of course, tone control and set up is a very personal matter, and one of individual taste. I also use an SF-2 in my rig, so if I can't get the tone I'm looking for, regardless of instrument, someone should just shoot me now!
The neck - I've not experienced the problems Roger has with his. From what I understand, Roger's neck is modeled after that of his beloved Rickenbacker 4001. If his Rick is like the two that I own (a '76 and a '77), the neck is relative thin both width and thickness-wise. I'm not sure how this plays out in truss rod adjustments and movement. Roger has three purpleheart lams in his neck; I only have two. What effect this has on the neck movement I just can't comment on.
I love my Dragon's Wing, but again, set up, neck profiles, tone shaping, etc. are all a matter of personal taste. If Roger is experiencing the problems he states he is, it must be very disappointing for him given the expense of what is obviously a very finely crafted and beautiful instrument otherwise. Again, I've not experienced these problems, so my take is that perhaps there is something about Rog's instrument that needs to be looked at, I don't know. Again, that is a matter between Rog and Alembic, and I'll stay out of it as it is none of my business.
Rog is right about one thing - it's your money, so pick the bass that works for you. For me, that's Alembic.
Best regards,
Alan