1 drawback to this method that I see is if its drawn for 4" wide material, the material MUST be exactly 4" or half of the parts will be off.
An advantage of Sams method, all parts will be identical regardless of the material width as ther is excess all the way around.
Still though, this "6 pack" method would be accurate if I did the 3 profiles along the reference edge, then unclamp and rotate the blank and do the other 3. It would be about 20" long, Would only need 4 clamps this way too.
Thanks men.