Just bought this system http://www.hobbylinc.com/htm/scx/scx10000.htm and was wondering if there were any proper reviews for it. It is scheduled to be due out late this month but it is currently on backorder. I am currently drawing table plans for it and was wondering if the layout size includes the outer most edges of the track and the accessories that plug into it (i.e. digital control board). Any help, advice, or general words of wisdom would be welcome as this is my first slot car track I have ever owned. Also, would it be feasible for my 3 1/2 year old son to "drive" the cars with supervision?