How to transplant the FreeBSD protocol stack based on f-stack?

[wangchong2023]

f-stack's user-mode protocol stack is great.
We want to port f-stack to implement some specific features. But we don't know how to port it. We want to have complete link layer, IP layer, network layer, transport layer, socket, epoll functions, and we also want FreeBSD tools and SCTP protocol to be available (in f-stack). Are there any instructions and introductions for porting or tailoring in this regard?
Thank you very much for your help.