OMG, that's the hardest X11 setup I've seen in my life
First, I wouldn't let the auto tools try and make your XFree86 configuration file. They assume basic stuff, and generally try to stick you with "vesa" or something similar. This setup is more specialized than I think it knows how to handle. Those tools also have a way of adding extra goop in there that make the file more complex than need be.
You're likely going to use the "nv" driver. The nv.4(x) manpage describes how to use it and what options it takes. (man 4 nv, on my system for the manpage, it might be man 4x on a default install, or try "locate nv.4") The other manpage to read is XF86Config.5(x) which is the format for the main config file. The drivers and files you have available to work with, of course, all reside by default under /usr/X11R6/lib/modules (although yours looks like it's /usr based, which might be a sym-link): "drivers" for the nv driver, "input" for your input device, "extensions" for any extensions, and so on. Writing the config file is just basically plugging those files/drivers into the file with the right options. The above manpages will tell you the right options to use and the right format to write in.
Because I see "AGP" in your "lspci" output, likely you're going to need AGP support compiled into your kernal(CONFIG_AGP and probably CONFIG_AGP_NVIDIA).
You can try these terms on
Google for (what appears to be) alot of info that looks relavent to your setup: "xfree86 Nvidia GeForce 256 NTSC S-Video".
The last help place is the Xfree86 mailing list. Try to work your setup, then if it still isn't right, post what you have gotten so far and be detailed; they will hopefully be able to help. The list is somewhat slow to circulate, so you might want to request that anyone that is replying CC to you so you don't have to wait for the next list to come out. Make sure to disguise any emails on that list as it gets alot of spam and you don't want your address harvested. You can also check the list
archives.
Sorry I can't be of more help, but it's a bit hard to set up a system you're not sitting at with hardware you've never seen.
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