Thanks again guys..! The page with details is almost done, just working out exactly what will be most useful to everyone to include in the kit.. pots, caps, metal, PCBs & hardware I guess... everything else is easily got at Mouser, Audio Maintenance & Don Audio..
Describing sound is always tricky.. but when I had it up against a couple of vintage units, a couple of colleagues (a mastering engineer & a mix engineer) couldn't pick it out against the other 2.
It was actually much easier to get this EQ section to match up to the vintage units than the mic pre which took a couple of revisions..
This time around, I started by tracing the vintage units that I wanted it to sound like, and seeing what changes were in it.. ie. famous 47pF cap mod etc.. and also making sure to use similar trace size or layout to the unit... (not sure in reality if this has an impact but still..!)