""""""""""During my build I must insure that my output results in a volume calculation between 8.9285 and 9.2000 cubic volume. I use the profile and sweep rails to fine tune the output to equal that volume, thus, they are broken up in line segments and arcs for minor changes. """"""""""""""

Remember that there is a minor "history" available.. So in your 2 rail sweep, your can create a nice single segment for rails, then just after the sweep, turn on the points for the rails and move one.. You'll notice the sweep update... Maybe this can help in adjusting volume intil it is correct....