I took my SST .40 to 177% for a 96" wing. The cost for wood was going to be around $300.00, so I went the foam route, and built with 1/2" pink foam, coroplast wing & fuse doublers, .7 oz glass cloth and polyurethane, some scrap 1/2" CDX ply, a little balsa flat stock to firm up the outer edges and PU glue. My airframe cost will be about $50.00. I'll use a 25cc weed whip conversion to fly it. BTW, that's a 48" 'yardstick'.