Moog Etherwave Pitch CV/Gate Output Circuit in Hotrodding Manual

Hi all - 
I'm relatively new to theremins - I was given an Etherwave a few months ago.  I was thinking it would be tremendously useful to have a Pitch CV output, but I was curious about two things:
1. Is the circuit in the "Understanding, etc. and Hotrodding Your Etherwave Theremin" generally considered sound? 
2. Are there PCBs already available of this circuit before I go to the trouble of laying one out? 

Thanks! 

I’m inexperienced, but the article you referenced is copyright by Moog, the company which created the etherwave at the bottom. So I would assume it to be correct.

There was a time that the modification to the standard Etherwave for CV was sold as a DIY kit, and a model with the CV modifications included was sold as the Etherwave Plus. The "new Etherwave" that was only on the market for a short time also had the CV + gate out and also had some kind of "bass extension modification" (decoupling of the oscillators). The bare basic populated circuit board, and an Etherwave theremin in kit form once were on the market.
 

Make sure you are using the most up-to-date copy of "Understanding...". An old copy of the document has an error in pins 13 and 14 of U1B.

Here's my design of the circuit board for Pitch CV, Volume CV, and Gate CV, as small as possible. It doesn't have decoupling caps, but it works great. You can order 3 copies directly from OSHPark. https://oshpark.com/shared_projects/Adt9d8ex

I got R16 tempcos from here: https://synthcube.com/tempco-resistor-ankaeohm-thermistor-3300ppm-1-6w/
I used these for C5 & C6: https://www.mouser.com/ProductDetail/505-MKP2D031001FKA00
I used https://www.mouser.com/ProductDetail/652-3299W-1-503LF for the Range pot and https://www.mouser.com/ProductDetail/652-3299W-1-103LF for the Scale pot.
Everything else is pretty standard. Some of the ICs you'll have to buy on eBay or elsewhere, as they're EOL'd and hard to find.

Here it is installed. You'll need to use a forstner bit to counterbore the holes (I prefer the inside of the cabinet rather than the outside) for the 1/4 jacks (but you can use any type of connector you want for the CV jacks).