The lower longerondoublers were pretty easy. The idea is to provide a square section for strength and to create the area for the electrical conduit area. Basically just floxing another triangular piece of spruce onto the lower longeron.
I live with my wife, daughter and two dogs Miko and Kaylee (shiba inu's - great dogs, go get a pair) in Hurst, Texas. We're active in our local church Countryside Bible where we work with the children's ministry and love every moment of it.