If you scan it into a computer and flip it you can also stretch it some in some programs to get a feel for what it would look like. However your best bet may be to then print it out and cut it up into a couple of pieces so you can add sections into it. That way your turnouts won’t become super elongated since strecthing is not area specific. You can also then draw one foot or 6" scale squares on the plan so youcan blow it up and trace it onto kraft paper or Plywood or foam to lay track and make sure it is in the right location.
I’ve gotten some excellent ideas of out responses to this post. Thank you.
Glenn Wolfe