Gap using Scarm - have 0.08" gap using MTH-O-RT

8/100's of an inch is nothing. Just connect all the pieces together before screwing them down.

I don’t see why not. SCARM uses tolerances of .079" and 2° whereas Any Rail uses .3" and 3°. I don’t know how either author determined those numbers, but I believe the author of SCARM told me once his were for HO track. You can change the settings in Tools/Settings/Edit, but I just do that if I want to run a simulation and don’t feel like cutting track to fit. If things fit with the defaults, then I know they’ll work in reality.

I remember seeing an attachment on the forum years ago about how to mix different lengths RealTrax to get certain lenghts.  I think it was called RealTrax track table or something like that.  It was very handy when I was laying track.