I had some folks peep my build and threw around some ideas which radically changed the intial build .. but here it is here: 
I already have a Moog Grandmother, and a Behringer 303 clone, so this may interface with those devices, or I might just from it from a controller keyboard or my DAW.
In general I wanted to build something that was reasonable "complete" so I can get to grips with it all, and think about swapping our or adding modules further down the line ... cos that's how this works.
I wanted a couple of rather different OSCs to add some variety of flavour and then have the fundamental tools to sculpt those a bit without getting in too deep or spending too much straight off the bat.
This will probably end up in a case larger than the 84 I assigned it for future fun/updates.
Am I missing anything important, or are there any ways I could "improve" this rig?