How are you attaching the lowers to the tank?
I'm in the Austin area (leander), and I have a DR650 with an IMS tank, if you'd like to look at it. Unfortunately, I'm not financially in the market for a fairing right now, but would love to see one developed for the DR, so I'd be willing to help out.
Can you do custom work based loosely on an OEM unit? My dad has an NX650 that the plastic has become brittle on, then he dropped it, cracking the fairing pretty bad in places. Not sure what he's willing to spend, but he's also talked about putting a larger XR600/650L tank on it, which wouldn't work with the existing fairing...