Steps!

So the previous efforts with etching payed off. The circuit works as planned, and while the intervals aren't quite as even as I was hoping, it should be easy to correct with resistor substitution. See below for a scope shot of the ramp output of the summing network and the buffered square waves feeding the decade counter.

Next step is to feed it through an amp with gain variable from 1 to 3 or so, and then a voltage follower, and then I'll really have something.