Beyond sector by paranoia press. There was a ringworld build by a TL17 society there. It got downgraded to a dense asteroid belt 

On Wed, Apr 29, 2020 at 3:56 PM Phil Pugliese - philpugliese at yahoo.com (via tml list) <xxxxxx@simplelists.com> wrote:
On Tuesday, April 28, 2020, 12:49:12 PM MST, Rupert Boleyn <xxxxxx@gmail.com> wrote:

On 29Apr2020 0725, Phil Pugliese - philpugliese at yahoo.com (via tml 
list) wrote:
> In one of the now-apocryphal license sectors (FarFarontiers?) there
> was a Ringworld, I believe, as well as, as I recall, I 'rosette' of
> planets.
>
> Don't recall what the profile indicated.
There's a partially completed ringworld in the Hinterworlds. That sector
was published in Challenge, and as far as I know it's still canon.

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No, that's not it.

This was definitely pre-Challenge, back in the old days when GDW licensed various outfits to generate sectors or, in at least one instance, a subsector outside of the 3I. I think it was located spinward of the 'Marches & rimward of the Zho's. It was in LBB format & they were all mentioned in a notation when GDW published the 'Atlas of the 3I'<sic>. It was mentioned that the licenses for the 3rd party sectors had expired & they had all been re-generated.

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Thomas Jones-Low
xxxxxx@gmail.com