Well at first I thought I'd be able to build a whole barn out of only old barn wood, but it didn't turn out that way. I had to buy all the framing for it, but thankfully I was able to use old barn wood for all the siding and things like that. I was also able to get the metal roofing free, which was a great blessing, since that is REALLY expensive. The holes it has don't really matter; some silicone will easily fix that.
In the pictures with this post, you can see the construction as it progressed. I had a lot of fun building it, and it is nearly complete.