Yes, there is massive churn as we race to launch right now. From the CLI you should be able to setup and run your own network easily. Running a local network from ip4 or 6 is also possible.
FFI has been ignored along with c# etc. for now as all resources are on launch of the core network. We are inclined to go for WASI.WASM binary releases for interoperability, but have not decided on that just yet.
As I say we have dropped pretty much all for launch, I Am sure the guys will jump in to help you out, but right now it’s not as easy as it should be for folk to jump in and run their own networks, many do, but there is no simple guide as such. @StephenC can maybe point you to some scripts if that helps.