hi Spearo,
Trackplanning is the work of your brains only, and some good old fashioned doodling by the squares is all you need. It keeps you from being overly optimistic. The squares were invented by the late John Armstrong a 50 years ago, in 102 Realistic Track Plans Andy Sperandeo is telling "newbies" how to apply them.
Only when this is done you are ready to use a CAD drawing program; the Atlas database only provides its own switches and only part of it, the curved turnouts are not present.
The program is free and has some things to learn, every program has. Questions were always answered, I found out some time ago , alas learning always is going a wee bit slower then expected.
Paul