Several yrs back I did a B15U game in an elementary school gym.
Similar issue as yours - small gym with ridiculous sidelines. Where the benches/table are there is no room to in-bounds the ball. Most spectators have to stand the entire game, because if you sit......your feet and other parts of you may be on the court!
My least favorite part though is there is a really, really low, permanent/non-movable basket on the near sideline by the V bench. At one point I was in transition and called a foul.....as I raised my arm to signal the foul my hand/arm went into the bottom of the net! (I'm only 5'8") And, to top it off, it's a CHAIN NET! Indoors?
The place is a hazard. I wrote my Assignor. A lot of good that did......