I decided to put plastic conduit for wire runs under the cabin floor on the left and right sides between the 2nd and 3rd outer most ribs. This requiured holes to be drilled in the cross pieces to pass the conduit through. I used Van's ribbed conduit; the same stuff as in the wings. I like the ribs because I know it will stay in place, even though it's a pain to install. After fitting the conduit, I rivetted the aft seat floors over top.
