the scale length won't be affected by how you design the neck, as long as you design the body to work with it. So you wouldn't be able to use a standard tele body with a true 24-fret neck.
personally, I think that the kramer pointy headstock would work better with a metal tele, but that's just me. I think there's a pic of a tele-like creation at vintagekramer.com, but I'm not sure.
also, about the pickup, look for more than just high output. high output isn't fun if it's all mud. My suggestion would be EMGs. but then again, I don't know what you're gonna be playing.