My first encounter with a rinky-dink gym was when I was in 6th grade. We had a home-and-home scrimmage series with a local Montesorri academy. The first scrimmage was at our gym and my friend and I wondered why Montesorri had cheerleaders for a scrimmage.
A week later coach had the reserves go to their place for the second scrimmage. The gym was so small that the free throw arcs and center circle all intersected. (I don't recall alternate lines either). They had no scoreboard, so the timekeeper used a weird football clock and a bicycle horn. And the score as posted in cardboad numbers behind the table.
Fast forward to this past weekend. Our CYO team played a team with a relatively new gym facility which was nice. Except that for some reason the scoreboard's horn did not work at all. So the timer had to use a whistle for 0:00. Timeouts were pretty much untimed and the referees had to take care of that.