Double Dragster, mainly for the Fiat half. That frame can be used for all sorts of early to mid '60s Altereds--Ts, Bantams, Deuces, whatever. I'm even thinking of using one for an early funny car a la Psycho or Colt .45 Mustangs. If you're only talking about the rails, I THINK I MIGHT like the Slingster better, but can't say for sure because I haven't built one yet. Both kits are "parts mines" and both lend themselves to all sorts of Modeler-Fu interpretations, variations, and modifications. Now we have both to choose from again. Is this a great planet, or what?