looking to see if there are layout builders in southern,n.h.or nortern,ma.
What scale? How much space do you have? What type of layout do you have in mind?
Are you looking to have a layout built, or are you looking for people who are building layouts of their own?
Hobby Emporium in Tyngsboro is in the Nashua area. Maine Trains in Chelmsford is a bit further down off Route 3 in Massachusetts. These are both retail stores, but they may be familiar with people who perform various train-related services.
Lance Mindheim is near you and is great MR’er. You can see his work in many of the trade mags such MRR, GMR and has several youtube videos you can see
ratled