In the Tunnels & Trolls Supplement, 1976, Ken wrote a short piece entitled "Beyond the Tunnels". This is a short essay on how to create a campaign world so that T&T need not always be about tunnels. In tupical KSA style the world has twice the gravity of Earth, magic is four times as costly to cast and there are no elves, dwarves, hobbits etc. Does anyone know if Ken or anyone else took this idea any further? Are there any more Warriorworlds out there?
There's this piece over on the Trollgod's blog: Beyond the Tunnels. I'm not seeing anything specific to your request in the post. It seems to be more of an archival rescue. You could always try over on the Tome of Visages page Ken created to replace Trollhalla when it fell to the code gremlins, Trollhallans.
I'll have the deep-fried battered pixie with balrog dipping sauce and a Hobgoblin ale.