I'm wanting to make a low profile variant that sits on top of the guitar body (hence the blade needs to be rather squat) ...there ain't nothing out there in the dimensions that I seek.
How about getting the blades from mojotone (addiction-fx are usually cheaper if they do them) and ask some one with a guillotine to cut them down? the cut edge could go at the bottom where it wont be seen so doesn't matter if there are slight shear marks. if you could get away with cutting it in the middle you could get curved and straight from one piece.