My Sobon frame (in spruce w/ oak braces) was originally cut and assembled as it progressed to ~3/4 complete then disassembled half a year later and shipped to me when I purchased the incomplete project. It then sat exposed in Mass ~6 monhts and covered in my field a couple of years before I was ready to erect and complete it.

I had surprisingly little trouble with twisting of the major timbers (possibly due to drying in an erected frame). I noted some twisting in the unfinished rafters (which spruce is very prone to do), and learned a few things about storing timbers the hard way.

1) Be sure to allow a decent air space between your tin and the timbers as well as between any tarping you have on the sides, and don't tarp all the way to the ground as it can trap moisture in.

2) I'd suggest laying down 30# roofing felt on the ground as a barrier between the timbers and any ground water.

3) Anchor Seal is worth it's weight in gold.