What would that take? Who knows, I think a four-lane plastic track, not two lanes put together, but a genuine four-lane wide track, with lengths up to 5-6 foot, several corner options including moderate banking. A combination effort by the whole 1/32 industry. Maybe it would be possible to spend $200 or so and have a 50 foot or more four-lane track in your basement that you simply take out of a box and put together and plug in controller stations. You don't have to be skilled to put it together, just like an HO train set, plug and play in 10 minutes.
Matt, back in the 60's there WAS track somewhat like that, just not plastic. Kal Kar made modular 4 lane track that was essentially pre slotted masonite. They also made it in two lane.
My dad made a 4 lane Kal Kar track using this stuff. I never run across any of this track, after all, in its static state is just 4 foot long pieces of masonite. The Kal Kar tape layer for it pops up on ebay once in awhile.
I was 13 or 14 when dad built the track, so I don't recall if there was only one radius curve. Dad wired it with a MRC power pack, had Cox controllers.