by Rick » Thu Feb 06, 2020 5:48 am
I'm not a layout guy and know nothing of the one you're looking for. But I do recall some older guys on one of these boards who were using or modifying one of the rocking(?) abdominal exercise machines as a layout aid to sitting up.
Will add that while we didn't use layout blinds in those days, I ran big white spreads daily for roughly a decade that we'd lay in. And the real trick was NOT to try to sit up to shoot, as sitting didn't just take more time but limited your range of motion/field of fire much more than just curling your shoulders off the ground and shooting from there.