@User: Yes. I am starting to integrate the PDK into our development server, and need to debug a few issues. Otherwise, the only problem is that the PDK is only as complete as the Google/SkyWater sources, and for those we're still working on the I/O pad cell library, primitive device library, and device models.

Is there a Schmitt Trigger input pad cell? This nice paper on a 0.13 implementation caught my eye: http://www.ics.ee.nctu.edu.tw/~mdker/International%20Conference%20Papers/0200573.pdf