Even though Wes recommends against using a Mag Racing track as a business/rental/party/pay to play track... I am thinking of trying it anyway... but not completely sold on the idea if I want to dive into it or not. So just tossing some ideas around on my AutoCAD screen.
Cars will need to be slowed down, and traction maximized, likely to the point of no sliding...
Yes that may make easy to the point of being boring, however this is what I have done to my SCX Digital track, and it works great for events.
The players do not feel the boring part until they have raced for a good 45 minutes, and usually most people are only at the track for 1 to 10, 2 or 3 minute races before the line cycles to the next person in line.
I have tried to make all the curves, so you turn with the curve to use the line, or change lanes, only a few places do you turn the "other way"....
And if there are enough people in the area to do club racing, then I will do that too... but obviously with normal cars

I have a few public places I can setup my tracks at, one is an indoor kart track (see Kart2Kart.com), the other is $600~$1000 a month in a super market.
If both fail, I will just ebay it... hopefully for profit to pay for the time that will be involved in its creation.
I've been working on changing the lines a little, and to get it to fit in one of my repeat clients spaces on an angle with out blocking their entrance, I will have to mirror the whole layout.
I REALY want to setup the pit lanes so they are rechargers for capacitors, which is what I would use inside the cars instead of batteries, but I will save that for a future upgrade. (there are a few posts on here about capacitor tech)