Well so far I'm loving the Woodland Scenics Plug & Play system. I went to Hobby Lobby today and picked up the P&P Switch for the Main Expansion Module. I had to rearrange my original panel setup. Each Light /Building Module will handle 4 lights + 1 switch if necessary. Each Expansion Module will handle 4 Light/Building Modules + 1 switch. I still need 1 more Light/Building Module. I also used 2 warm white LED P&P lights, one in a 3 story building that I bought used and the other in an old Lionel caboose body that I use as a railside maintenance building.
Hobby Lobby has a 40% coupon that can be used for one item per visit. I haven't been in a hurry so I've made a few visits when in the area.
I still have the six Woodland Scenics Buildings to Plug in. I now have Window Diffusing Film to put in the 3 story used building. Projects never seem to end thank goodness.