The vast majority are in 4/4, although I wouldn't be surprised to find a couple in 2/4 as Rockabilly draws on Country every now and then.
As to scales, arm your self with the basics (Major, Minor & pentatonic) and you're good to go.
The challenge with the Rockabilly is to keep it
really simple. R-3-5-8 and R-5 are core with a bit of walking, and it can be tough to keep it interesting with a relatively limited palette. Worth it though, the minimalist approach has (for me) a beneficial knock-on for playing blues. A key trick is to try to get your head into "Double Bass space" - it's a different approach, but (IMO) vital to catch the vibe.
Total immersion will help - especially from the source material. There's a bucketload of good compilations out there that cover the 50s. Check out any of the early Elvis Sun Session stuff (especially the album 'Elvis Presley, Scotty & Bill' released on the Deltamusic label), Billy Lee Riley (Red Hot), Gene Vincent, Eddie Cochran, etc. etc., as well as checking the newer guys such as you mentioned. Don't overlook Brian Setzer either, his stuff is superbly crafted & very accessible (check out 'Rockabilly Riot! - A Tribute to Sun Records').
Thanks for punting "Fiend Without A Face" - I only know it as the classic
Arthur Crabtree Sci-Fi B movie; the band are great, but rather eclipsed by Necromantix, they might be my band of the moment for a while. Awesome.
Pete.
