On the subject of sport in Traveller:
The HIWG has a designated sports analyst, Nick "Battle Damage" Law,
who wrote a detailed set of rules for grav-ball in such a way that it
can be played out as a sort of board game. He also described league
structures for it in the Imperium.
I have a copy of this on paper, although I have never actually tried
to play through a game of it. Unfortunately I don't have a copy in
computer-readable form, but if there was enough interest I could get
in touch with Nick and ask him if he has a computer-readable version
that I could post to the list.
Alan Huscroft
[email removed]