C
after cutting the boards I laid them out

 S
here is a close up of the joined boards

 U
clamped in place ready to drill the holes

 H
after drilling the holes the bolts are in place holding the basic frame together

 T
overview of the assembled frame

 W
close up of the cross brace showing the tongue

 I
cut brace at other end

 T


 L
router with router bit to show how the groove will be cut to accomodate the tongue

 O
router in place to show how the groove will be cut

 L
cut groove

 O
frame was disassembled, the brace inserted and reassembled

 M
from another angle

 F
after finding that the nuts and bolts would interfere with the placement of the hinges I reworked the fasteners and used T-nuts

 G next