How about a bag of parts with instructions for those of us who really miss Heathkit? 
Someday, maybe: but, if you look through that giant "transistorized ignition" thread, there was a Velleman kit in there: you could use that schematic and gather up the parts in the meantime. One other SOHC4-er did just that, and he's in that section.
I've got so much going on with these right now, I don't think I have time to engineer up a kit!