Epoxied the ribs to the uprights on the rear spar and sanded ice-cream sticks into little wedges, inserting them between the rear of the rib 'pocket' and the spar web instead to using the nail method.
As per the plans the rear spar is 7/8" thick and the space for it to slide through the rear of each rib is 15/16" wide leaving a 1/16" gap on the webbing side of the spar as seen in the photo. I had some aircraft grade hoop pine from a previous build (KR2S) which I machined to 1/4" x 1/4" and then sanded down to a little less than the 1/16" wide and have used as spacers to fill out the gap.
It doesn't look too large in the photo but is definitely a full 1/16" gap and I am just a little unsure if the T88 is strong enough when bridging this distance so I erred on the side of caution.
