I found an error in the schematic at the very start of this thread (a wrong component value).
I didn't correctly document what I had actually built with the SAD1024 circuit, and that schematic error then made it into the MN3207 design and build.
In the MN3207 schematic, R21 should be 5k1 instead of 5k6. This change affects required component values in other places, namely the ratio of R32:R31. So the MN3207 circuit needs the following two resistor value changes:
R21: 5k6 --> 5k1
R32: 220R --> 180R
If anyone has already done a build, then those changes can be made by adding resistors in parallel to the old values.
5k1 ~ ( 5k6 || 56k ).
180R ~ ( 220R || 1k ).
With these 2 resistor value changes (and a clock trimmer readjustment), the sweep range on my build with Range pot at maximum goes from 1ms to 12 ms as before. So why make the change?
The difference is that with the Range pot at minimum, it will now sweep slightly higher (i.e. under 1ms) which is what happens with the original V2 EM. Using a value of 5k6 would not let that happen.
I won't keep posting schematics. I will just update the schematic and parts list in the build document:
https://1drv.ms/b/s!AvrH61utWEtEjig_4U8k7-fGwkbv?e=69cQg1
