I have been experimenting with SCARM for about a month, and it is a fabulous program. I have been using the Atlas track, because that is what I am going to. I now have realtrax, but it doesn't have the curves I want to use.
It seems to me that the straight section of the O54 turnouts in SCARM is fixed at 10", while the actual length of the straight in the turnout by Atlas is 14.5". Maybe this has already been addressed and I missed it. Anyway, the program has been fun to work with and I've learned at lot.