Yea, you could probably place them over the rails. Replacing them, like I said, may be a different story. I'm not good at anything with modeling, so I have no idea how any of that works. (literally the only thing i know how to build is in roblox studio.)
I feel like this map is just a smidge too big, maybe like 5-10% too big? I don't know. Also, I get like 20-40 FPS on average on this map, but with the unstable Vulkan API I'm getting like 55-80 FPS, it's a huge boost. I can tell the map itself needs huge amounts of optimization done (I'm not seeing any LODs or anything, for example) to it, but Vulkan itself is helping a lot.