You may want to verify the basic approach. I personally do not like using Groups for recording as they are post
fader sends which means that you are stuck with all the
channel faders affecting both the
house and recording mixes. This is often a less than desirable approach given that the people in the
house get direct sound and room reinforcement that is not present in the recording, something especially relevant in concert recording. I personally also like to be able to include the overhead or ambient mics in some sends such as
ALS,
stage monitors, backstage feeds,
Lobby feeds and so on, which would not be possible if they run only to the recording
mixer.
It does somewhat come down to a balance of simplicity versus quality and flexibility. The arrangement you describe will be fairly simple, however it is also very limiting. One option would be to run all the sources to the main
console and use aux sends on the
console to create an independent recording mix, using the 11x2 matrix outputs would also be an option, although with less finite control. Possibly the optimal option as far as flexibility and quality would be to use the Direct Output on each
mono channel, along with Group, Aux or Matrix outputs or splits prior to the
console if you use the stereo inputs. You could then create a truly dedicated record mix and/or and record all of the sources as a multitrack recording to be mixed or edited later.