Hi David:
There are several "plans" that are published in the many timber frame books available. Most center around the 12 x 16' shed and are designed to expose you to the different joinery options available. (There are many paths to the same destination.)
As for material sources in the Memphis area, you shouldn't have a problem locating good quality, locally milled timbers. You should check out
www.forestryforum.com. There are many small mill operators in the Memphis area and if you check down around Tupelo, you will probably get better pricing.
As for gluing your own SIPS, that is pretty laborious and the results aren't very good. There are many enclosure systems out there. SIPS is definitely a good way to go and if making a SIP panel is your way of cutting costs, then you might want to check out what is available first. SIPs manufacurers have spent millions of dollars developing their products and they offer good products for a very price. I don't think making your own SIPs will save you money. The guild offers a book titled Timber Frame Joinery & Design Workbook that discusses several different types of enclosure systems. You might get a copy of that see what you think. I'm cutting my first frame for sale right now and the client has decided to use straw bales as part of his enclosure system. Anyway, have fun!
