Just in case this is relevant to anyone reading who doesn't feel like figuring it out: the concrete won't cover the stairs until you edit ground material in a way that affects that on the central square, so you can place objects and paths but not concrete ground for the parking.

Strange, I'll look into it when I have the time, I have been busy with other projects as of late.

Correction: I swear the ground material thing used to work but doesn't now. Personally just gone with revising layouts and using some other parks to similar effect lol

I do already have some standalone parking lots available for download. When I get arround to this, I'll have a look at revising this mod in particular. No idea when that will be however. Thank you for the reccomendations!

Had the same issue with my own custom stations with parking; it's got to do with the ground material, you need to use the material type for gaps or see-through, I forget what it's called but it's the blue-ish one.

The problem is that it will lead to some dirt patched between the metro station square and your outer pavement. Personally what I've taken to is just making a variety of separate parking lots/picnic areas to build up little station complexes. They fill in any small lots around curves as well as gaps in your overall park coverage.

I could see you switching your into a matching set of modular buildings; like the center station piece and flanking parking lots of different sizes or designs. Thanks for sharing!

weird, i'll be sure to look at that.

The ped "hole" just shows as a pavement.