I thought it might be a good idea to sequester my questions here rather than clutter the build thread. I'll give it a go and we'll see how it works.

Question 1: When should I buy wheels and tires?
I'm thinking it would be valuable to have them now as I'm sorting out suspension, steering rack, ride height, clearance. On the other hand, I'd rather not have to store them and I'd prefer to buy the tires nearer to the time they'll be used. What do you guys say?