I suspect you are referring to a Davis' M&G lock - yes?
And L&R double set triggers?
Davis makes a fine lock. I have not used/shot every one (maybe some day) but have never personally had an issue with a Davis lock.
If you are getting the Germanic styled classic from Davis, I think you will be pleased.
Personally, if I can get "the correct" lock from Chambers, that is always my first choice. But I'm a builder and just find the Chambers locks finished far better than the others. So less, work for me.
But have zero reservation in using a Davis or L&R lock if it better suits the style/function that I am building.
I occasionally use L&R double set triggers (have a set of L&R 1710's on my favorite rifle) - normally due to availability. Once tuned they work every bit as good as Davis (and at the moment it's tough to get Davis triggers due to supply issues).
If you stick to the major lock makers - Chambers, Davis or L&R and use Davis or L&R triggers, it's tough to go wrong 99 times out 100.
Bottom line, would I build a rifle with those components - absolutely.
What barrel are you getting with her?