Pat,
I too have a Thunderbird (an '87) and an RD Artist (a '77 - BTW, they stopped making them in '81, so yours can't possibly be an '87, maybe a '77?). The Alembird looks much more like a Thunderbird than an RD to me - less points, more rounded. I too love the fleur (called by some to the the shrimp inlay) inlay on my RD, and it sounds awesome. The one thing I don't get about Steve's Alembird is that most of the higher frets (beyond the 17th Fret) are inaccessible (or so it seems from the pix). Maybe this is OK with him, and that's cool.
One of the complaints I have with the Thunderbird (other than neck dive) is the difficulty reaching the upper frets. Maybe the Alembic Elfs did something to make them more reachable? Steve, any insights?
In any event, it's a beautiful bass. Steve got what he wanted, and that's all that counts ... now, where's my checkbook?
Alan