I have my phone call with Seven coming up soon. I've never bought a custom bike before, and I'm horribly afraid I'm going to forget something crucial but unlikely (the way you forget your underwear when you're commuting, or sun block on a really long, hot ride), so I need all you custom-bike-buyers' expertise:

What should I ask the bike builders about, talk to them about, or think about?

Help me with all the things I'd never think of!