In order for me to have a half circle at the end of my shelf layout how wide does the layout have to be? I plan on using 22" curves. This is my thinking... the half circle is going to be 44" in width, plus an inch or two just for safety for the trains = at least a width of 48" right?? But my concern now is if I have to reach the back part of the layout 48" is a heck of a reach!! Hopefully that all makes sense