I did a similar thing for my final university project whilst studying Computer Games Design. Here is my final circuit (granted it was designed as a Destruction Derby track, hence the rockslide, broken bridge, and crossover, but still, it won me a competition a few years back on this very site!)
Anyway, these tracks you’re coming up with look so very… Tilke.
Just a suggestion. Have a root around on google maps, find a location you like, possibly using public roads, or maybe just an interesting looking large field, flick between the terrain and satellite views so you get a good idea of the elevation changes, and have a go at working a track into the available space. It also roots your design ideas and implementation firmly in the real world, giving you real world obsticles to work around.
It’s more fun and far more rewarding that just drawing a squiggle on a blank piece of paper.
Here are a couple that I’ve down recently. One is a random field in Italy somewhere, which tries to squeeze in as many interesting corners as possible, as well as multiple layouts (pit buildings in blue, grandstands in brown, spectator banking in light green, trees in dark green).
The other is a public roadway around a hill beside a place called Perry Lake somewhere in the US. This gives interesting gradient and a naturally flowing circuit. (track layout and pitlane only, kind of a work in progress)
Have a go, see what you can come up with!