Where do you get them printed?
Some of us have bought boards from a small Chinese company with the necessary equipment. They already have several designs to offer, and they'll do a custom design for an addition CAD file charge. I've purchased a set of the 304 diode boards and also had them design a 128 diode board for me (lower heat) for veg.
We don't discuss it in the open forum out of respect for our Sponsors but PM me if you want the contact info.