Building a Log Cabin. Need Some Help.

I am going to be building a vertical log cabin 32'x24'. I will be using all red cedar trees that are on the property. I am planning on getting all my materials first and prepping the logs. After I have everything I will then begin to build. I plan to use a pier support foundation with 6'x6' pressure treated lumber, sitting 24" in the ground (that is the frost line). I will space them 8' apart, giving me 12 supports. I plan on using main support beam s running across the width (there will be 2) and 1 support beam running the length. Creating (essentially) a grid pattern of 8'x8' sections totaling 8.

My questions are, when affixing the floor joist, should I use 2"x6"s standing on end or laying flat around the perimeter. And, I plan on using cedar trees for the roof trusses and applying the plywood directly to them. Will this work as well as a traditional roof, built with store bought lumber?

And lastly, how long will this take, (assuming I have all the materials prepped within a month) how long to put it all together and get the final house?

Thanks if you can help.