SO... I'm not sure if anyone else does this but my neighbor and I kind of figured out how to make a rail with interchangable legs...AKA you can make the same rail an up rail/down rail/urban/whatever
as you can see in this video the same rail is used as a flat and a street style down
https://newschoolers.com/web/content/viewvideo/id/282720/
If there is enough interest i will make some sort of tutorial !