This, too, was another project I designed in the hopes of making something quickly and easily. Like 7H9H, it turned out to be more complex than I thought...
Actually, the main reason I didn't carry on with it was frustration at my own artistic abilites, or lack thereof. I had to design the art for many cards, and I just couldn't do it, so I gave up. If I improve my drawing skills, I may be more eager to return to this.