I run with my kids (3 cars) on our mini 96 just fine. If you get more than 2 deep in a turn it can dicey unless your racers have some experince with passing and overtaking. The expansion pack is well worth the cost as well. Be sure to check out the new stuff rcp has coming in his vendor forum.
There are other options if you go the table top vs. Making your own such as realtracks. There small tiles That may fit on a good sized table but it
may be tight of your concerned about a mini 96.
There are some videos with various tracks, take a look