We did a job similar to this a few years ago in NC.The wall finish was 3/4 tongue and groove pine with 3/4 furring strips fastened to the studs behind it. The baseboard was 5 1/2" tall. With the ahj's blessing we left a loop of wire in the wall for the receps,And spray painted the locations on the floor.I,as did the builder took measurements as to the locations of the receps.He had his carpenters to cut out for the boxes.We used a deep metal raco box with ears.The boxes were not installed till trim-out time.It required a lot of coordination/communication but it worked real slick.I don't know if it'll work for you but it might be an option. Russell
