Set up the curved sections and put your largest engines and rolling stock on both curves and check for any overhangs, steps, steam engine cabs, etc., that may hit.
Also- if you change the direction of the short siding on the bottom and move the turnout one track to the right, you could make the siding longer and maybe even add a second. Don't know what you had planned for the empty space on that side of the table but it could be a nice freight yard with Opp acc.
The long siding that wraps around could become a passing siding with a second turnout at the end too.
Bob