I, personally, prefer to use flextrack, rather than sectional track. You can curve it in any direction parallel to the mainline and requires only one feeder every six feet, if you solder the feeder to the joiner. Bob Hahn
It’s going to be a piece of flex track. If you need assistance in deciding radius, curvature and length, download Atlas Right Trak and use it to create the parallel tracks and curved section. Use the 'ladder function" to create a 2 track ladder using the #6 turnouts you have.
Be adventurous. Use flex track. Buy some track cutting pliers (or go to Radio Shack and buy "flush cutting pliers, they’re cheaper) and trim off the track to the length you want. Draw a line you want to put the track on and put the track on that line.
How do you get the track lined up? You look at it and bend it to a smooth looking curve.