The web site would have been much more useful had some of these cards been available for purchase but most of them are literally swallowed instantly when they popup by a few collectors and many parasitic resellers and for ridiculous prices. Thus nowadays no further development, support and hacking could be expected. One would prefer to use an ordinary apple2 or a clone instead.
I do have a PCB file available for the trackstar floppy adapter I designed a few years ago, for people with a card and no floppy interface card. I'll dig it out and upload it in case someone finds it helpful.
I'm a "research collector" and "collect to use" kind of guy; everything I listed has outlived its purpose for me, thus it's all better off in someone else's hands. So if you're interested in owning & trying out one of these cool gizmos, here's a fab opportunity - as they don't often pop up for sale, and when they do, the sellers are generally greedy bastards.