Lace aft fabric between grommets, across width of fuselage, with 1/8" nylon rope. Add nylon cable ties between snaps on engine mount diagonals for strength. Then stretch underbelly fabric with ratchet straps, line up snaps with bottom edge of ast bulkhead, locate position for male snaps, drill out and rivet them into place with 1/8" rivets. Snap fabric into place and release tension on straps.
