Well done!
I did a major resto-mod to a variant of this console a while back, came out of the Hollywood Record Plant remote truck.
It had some cool features, true dual inline channels (at what, 1970?!) AND the EQ is switchable between the mic path and line path. Proper dedicated active balanced line input, rotary and linear faders that can be reversed.
Added 8 Group Mute buses to the channels using the VCA group select funky switch.
Built all the ACA/Boosters using the CAPI boards.
Same 16 track MTR bus, I built a "remix" section that sums the 2 Stereo mixes and all 16 bus in Stereo groups on Stereo faders (all individually available on CRM source select), all feeding a Grand Master fader, works great.
We used the Purple Audio CRM made to drop in the old APIs, made a lot of stuff easier.
All the VCAs were removed and the channels reworked, after doing that I think you made the right move making new boards and building them out.