Gentlemen,
I like to use star wiring and then add my Legacy drops to the opposite outside rail of the DCS wiring. Long ago MartyF advised me of this wiring method and I have been using it ever sense with great success.
Further there are many DCS layouts being run with the Bus wiring method and running great. When I advised about using the Star method with blocks, it was because I know it work all the time. For guys adding DCS to their older layouts, as Barry always says, try running DCS with the existing Bus wiring 1st. Your new DCS may work perfectly fine, especially with the newer TIU up grades.
When constructing a new layout, especially a larger one in your home, I do recommend the Star Wiring method and Blocks, with no more than 10 -13 Track joins , using this engineering method, your new layout will portray a Constant 10 signal level thru out the full layout. As Marty teaches use the opposite outside rail for the Legacy drops as you build your DCS star wiring and the Legacy signal is fantastic.
Further IMO you should always use high quality 14 gauge Stranded wire for a DCS layout, heck because I have it, I use one of the high quality 14 Gauge Stranded Black Wires for my Legacy drops also. Not a mandatory requirement by any means.
Track is a personal preference matter. If you are stuck on realism and a serious rivet counter, go for it with the Atlas and Ross. Myself I am a Tin Plate kind guy who likes child like wonderland layouts. My main Track is FasTrack with Command Control Switches, with inside RealTrax or Conventional Tubular. Each to his own build what you most like.
Remember however when choosing track, if you run Tin Plate Trains, certain Manufacturers Track does not work well, get some advise before you build. The other engineering reason I like FasTrack is FasTrack accommodates most all the different types of engines and rolling stock, so does Lionel Conventional Tubular. I do have a lot of both including the old 711/072 Lionel Switches that take massive power to operate correctly.
Long ago when DCS 1st came out, before Barry had even written his 1st book, he helped me with massive advise on my bigger DCS layouts. The 1st generation DCS was not like todays, his advice and MartyF's also, along with my own engineering knowledge and experience, made my DCS layouts work correctly. I owe both these guys big time for their early advise, that I still use it even today, as I build my layouts.
IMO anybody building a DCS/Legacy layout should own Barry's O Gauge Companion book, further the OGR Video Guide to DCS is to me a Great Instructional Video, visual learners this is right up your alley, especially great for beginners.
PCRR/Dave
Our Traditional Living Room Layout featuring the Lionel/Hallmark Toy Maker Santa Express, and our Christmas Moose peering around the Snow Covered Christmas tree. Not all layouts need to be DCS or Legacy, LC & LC+ are seriously Child Friendly Train Layouts, at Christmas Time.
Merry Christmas and Happy New Year everybody!