another option for the OP:
made by Aldridge Empire.
those are the 2nd generation of that design, the first one was made for me only, I think
I got mine (7pcs) for around US$ 100, a lot more cheaper than ABM.
it's for top load string mounting, though.
you could ask for string thru body version like mine, but maybe you'll have to wait for a little longer.
and if you have your own design, he'll build them for you.