here's what worked well for me..
http://forums.tfguild.net/ubbthreads.php?ubb=showflat&Number=22170&nt=3&page=1
Look into the plank method mentioned by Timbeal. Pretty sure it would save a lot of wood, it was my first choice, but had to go with what made the officials more comfortable smile
Having those empty 2x cavities on the outside of TF made running wires a breeze though....

there's a thin line between hobby and mental illness