Elliot,
As I've said to others, welcome to the madness. Since you obviously want to built it, I won't suggest buying a used one. You didn't mention what you budget is, or just how skilled you are with fabricating. I haven't built one myself (yet), but I am getting the Beck that we're all assmbling at the Carlisle, PA show. I strongly recommend that you attend this show as all of the manufacturers except Vintage will be in attendance, and there will be enough Vintage Speedster owners there to fill you in. Here's what I know from all of my research, but keep in mind that NONE of this is 1st hand experience:
- Intermeccanica and Specialty Autoworks appear to only offer turn-keys. Wonderful cars, both of them, but I don't believe they offer kits.
- Vintage only recommends their kits for professional builders. If you're very talented, you might give them a try, though.
- Of the four manufacturers that advertise their kits three are Beck (Special Editions), JPS Motorsports, and Thunder Ranch. JPS offers the choice of VW pan or proprietary tube frame. Both Beck and Thunder Ranch are tube frame only. All three have excellent reputations.
- Street Beasts is a little different. They offer several stages of kit, and are probably the least expensive. However, the general consensus is that they have some quality issues that will require quite a bit of fabrication and rework to overcome. Still, I've seen some beautiful cars resulting from these kits, so it can be done. Just take a look at the metallic blue Speedster on the Carlisle website. That started as a Street Beasts. Oh yeah, I believe Street Beasts used to be CMC.
** PERSONAL OPINION WARNING **
I like the fact that the Beck is available in a kit that is already painted and has the interior, wiring, top, and much of the trim installed. All you do is add drivetrain, finish the suspension, and complete the trim. This is their Deluxe kit and is what we're building at the show. We expect to be driving the car by dinner time on Saturday. Come watch!