I'd be interested in buying it, even though I have the full Miami, and AmiTCP packages. There's always room for a new TCP/IP on this platform, as long as it will be well supported, as I wouldn't want an instant departure similar to the support that occurred when Holger Kruse abandoned Miami.
So, yeah, come on let's see it completed for the Classic 68k hardware, I'd pay for it.
My only reservation is that I feel any commercial package should come with an easy to use GUI, online help, and PDF manual - if there isn't a printed one, and a good installation script.