Hi bob - was curious why you never used the the built in ADC. ( or maybe you did and did not like the results)
i built something similar to yours. only based on the emontx form factor- inter changeable software and hardware from arduino to esp ( wemos d1) the only difference I guess Is i used the onboard ADC to do the voltage calculation and it left a full 8 ADC to stack up to 4 units or what ever number of free CS your board supports… 32 cts on a esp and 36 ct if used on adruino and enmontx sheild. ( do not have 36 ct so i can not attest to whether it works well with 36 ct s but it will support it _ I only have 12 cts - but it works fine with those)
but yours looks nicer then my hand built ones