The Imperial Schrade plant is just another abandoned industrial site today. Nothing to see (unless you bring the weedwhacker). You probably won't find CSC without help. It isn't hidden, just non-descript. And no, they really don't appreciate unannounced visitors. For hardcore knife knuts I can offer a few weak suggestions. None are overly good.
1) The public library has an attached local history museum that you may find interesting. One small section on Schrade.
2) The hardware store in the old plaza in Napanoch has an electic mix of cutlery. Everything from true mall ninja to true Schrades. And everything in between, including some barber items. He is a nice guy and I enjoy his store but he expects to be well compensated if you get my drift.
3) Since many knife people also are outdoors people I would highly recommend spending a half day or more up in Cragsmoor at Sam's Point. Great hiking.
4) Not sure if it is relevent but Ellenville is also a hang gliding and paragliding hotspot.
5) If you are into mysteries, I suggest trying to find the remains of the Napanoch knife company. Some say they know where it was/is, but I've never been able to confirm it.
Looking back at my list, it seems like a lot. It isn't. You are welcome to drop by but there isn't much anymore.