My last track was built on my dining room table in a "B" configuration. It was doomed because A) It could not be permanent and B)The surface was too slick.
I have started building my second track.
I am using an old desk, dimensions are approx 24" by 42".
Lane widths are 8".
Surface is construction paper.
All other componets are cardboard.
Cost so far, $2 for the construction paper, and $10 for the pizza that donated its box.
Here are some pics.