[Richard Coutts-Smith]

Ok guys,
Had a quick go around with the tape, all measurments in inches.
Steel stiffener, 38x 7/8 x 1/8, with rounded ends and sewn into top back of canvas.
Main bag, 38 x 26 x 3 NB the bottom actually measured out at 37, not sure if this is shrinkage or supposed to be out of square.Bottom corners are square not angled or rounded.
Flap is 38 x 6 with 45deg. corners folded down to the seam at 2in.
Four press studs, 2 1/2 from the side (and from the satchel in the middle) 2 1/2 from the top.

Document satchel (Fits workshop manual) 11 1/2 x 9 x 1 1/2. Flap is two peices of 1 1/2 sewn to give a right angle. Two press studs 2 inch in from the side, 1/2 in. from the top

This bag has the bolted fixings, not the hang up loops. Assume that both variations had the steel strip to stiffen them.
Hope this helps, no scanner so don't ask for a drawing but any other measurments you need, fire away.
Rich