I'm planning on building a 24x32' pole building with 12' walls as well. Using the book purchased here for reference: http://www.easybuildings.com/order.html Shows pretty much every step in detail, from post to trim.
Otherwise in my county no engineered plans are required. I sketched out a basic...
True, it would be small if I left it at the 18 (17'4" interior) depth. If I went with 4 posts at 8 feet apart instead of 3 at ten I could just add more rafters to adjust the depth and get 24 feet.
This is a jumping off point of course, as I don't think the plan would get approved as it is now...
I found online a plan made by the University of Tennessee's Agricultural Engineering department back in the day. It is marked as "Contemporary" and includes a drawing of a Jaguar XK-E so I am assuming it's from the late 60's or seventies. I love the look of it and am thinking of building it. I...