These are the feature lists (to summarize) I'm considering:
Baby board (1590A) - 2 stages, simple LFO
Lite (1590B) - 4 stages, simple LFO - can build either a phaser or something similar to the Faux Vibe
Regular (1590BB) - 6 stages, rotary stage OR regen selector, Univibe switch, Maestro LFO
Deluxe (1590D?) - 12 stages, rotary stage AND regen selector, Molten Voltage MV-55 implementation, plus an alternate LFO with added controls (maybe a mash up between the Maestro and Tremulus Lune).
This stuff isn't for sure....just possibilities. But, it's also kind of an outline of what I'd like to do with a few different projects- multiple version with different features to meet the needs of the builder, i.e. taking a core design and then offering different versions with progressively complex features. Some folks may want a simple phaser in a 1590B, some may want a space ship.