Productive few days. Built an SFT circuit on Monday (worked first time!), and finished off my meatball clone circuit - alas it didn't work first time! Missing 2 jumpers was the main problem, and the inverting amps on the lp and hp filters were referenced to ground instead of vref by mistake. Took some scoping to find that in work this morning!
Not an easy circuit to debug, but looking forward to getting home to try it out! Now have 3 circuits to get built up into enclosures - these 2 and a knobless fuzz (mastotron done with trim pots destined for a 1590A enclosure).