This seemed pretty fast to me; Baron gets you to $5 easily, for buying Rebuilds and Duchies, and it can also pick up Estates (either when you don't activate it, or with its +buy when you get to $7) which you want for Rebuilding. Baron/Silver gives you a good chance of getting at least one Rebuild on turns 3/4, and if you buy a village of some sort along the way, you can discard the Estate before playing Rebuild, which solves something of a problem that Rebuild can have.
Is this a thing?