Diy Outdoor Sectional Sofa . Looking for an affordable outdoor seating option? Sketch a layout of sectional with measurements. I made my wife a sturdy outdoor sectional out of cheap construction from www.pinterest.com Once the sides of the sofa were assembled, i attached the 2×3 stretchers, again drilling 1 1/2″ pocket holes and. Armless outdoor sofa plans ; To make it a sectional, simply make two of these couches.