ONCE THE FRAME PIECES HAVE BEEN NOTCHED, IT’S TIME TO CONNECT THEM TOGETHER. THIS IS WHERE THE 2 BY 6’S COME IN. WHAT YOU WILL DO IS ATTACH THE 2 PIECES TOGETHER USING A COMMON BRACE..A 2 BY 6..CUT THE 2 BY 6 TO FIT THE FRAME:

BEFORE YOU SCREW THESE TOGETHER, MAKE SURE YOU ARE USING THE 2  OPPOSING PIECES YOU CUT OUT FROM THE SAME SHEET OF PLYWOOD..DO NOT MIX THEM WITH OTHER CUT OUTS..YOU’D BE USING NUMBERS "1" AND "2" ON THIS FIRST ONE...WHY? BECAUSE WHEN YOU CUT THE 45 DEGREE ANGLE, YOU MAY BE OFF..IF ONLY SLIGHTLY..IF ONE SIDE IS 44 DEGREES AND THE OTHER IS 46, WHEN YOU PUT THEM TOGETHER, THE ERROR CANCELS ITSELF OUT (PRETTY MUCH!), BUT IF YOU TAKE A 46 DEGREE CUT FROM ONE SHEET AND ANOTHER 46 DEGREE CUT FROM ANOTHER, NOW YOU’VE DOUBLED THE ERROR, AND THAT WILL HAVE AN EFFECT ON THE CURVE..WHICH YOU OBVIOUSLY DON’T WANT. SO CONNECT "1" AND  "2" TOGETHER FOR THE LEFT SIDE OF THE FIRST SECTION, AND "3" AND "4" FOR THE RIGHT SIDE. MAKE SURE YOU ATTACH THE 2 BY 6’S ON THE INSIDE OF THE FRAME PIECES, SO THEY FACE EACH OTHER, LIKE SO:

Drill through the plywood with the 1/4" bit first, then screw through the plywood, into the 2 by 6’s.
 
 

THE NEXT THING TO DO AFTER CONNECTING THE FRAME PIECES IS TO ADD THE RIB SUPPORTS...THIS IS ANOTHER PART OF THE PROJECT WHICH IS NOT A LOT OF FUN. THE RIB SUPPORTS ARE 2 BY 2’S WHICH ARE SCREWED TO THE PLYWOOD FRAME, TO GIVE SOMETHING FOR THE 2 BY 4 RIBS TO CONNECT TO:

THESE ARE SCREWED IN ON THE SAME SIDE OF THE PIECE AS THE 2 BY 6 CONNECTORS, THROUGH THE PLYWOOD AND INTO THE 2 BY 2’S..DRILL PLYWOOD WITH 1/4" BIT FIRST, AND USE A 2 BY 4 FOR MEASUREMENT TO MAKE SURE THE 2 BY 4 RIBS WILL BE FLUSH WITH THE FRAME!

SO NOW YOU HAVE WHAT LOOKS LIKE THIS: WELL, YOU'RE NOT QUITE THERE YET BUT YOU CAN GET AN IDEA OF WHAT THESE RIB SUPPORTS DO..