Thank you everyone for the feedback! I will consider all the options. I am really drawn to the aesthetic of the clam, but I understand the problem of lift. I know that they're bolted to the tub along the side- but I thought there was some sort of rod that held them in the front that was attached to the frame near the front- I guess I was mistaken. It does seem a big committment to drive bolt holes into a tub that doesn't have them already, should you change your mind. What I wonder is...has anyone ever tried to custom fabricate a "quck release" system that would allow you to switch them fairly quickly, so you could make a change if you were switching between a track day and touring day for example? Maybe I'm the only one who thinks this is a good idea.
I've got some hot rod friends who I might ask about this. What if the clams were some how suspended from the lip of the tub beneath the bonnet? It would have to be rigid or it would be a vibration/noise disaster.
Yep, I've only driven a Birkin once, on some California back roads, and I was hooked for life. It's pretty special when something you've lusted after for decades turns out not to disappoint in any way.