I wish I'd thought of beveled edges, took me a week of grinding to round over edges!
The addition I made years later, a post from table top to ground with a swinging seat adjustable for height.
Since it swings, I can get it under the bench, out of the weather.
The latest incarnation has a heavy steel box between front legs to keep assorted range crap in,
Stapler, Staples, push pins, clamps, extra paper targets, even the chronograph in the summer. Beats lugging that crap back & forth...
I know yours is a public range and you can't leave your personal stuff there, just ideas if they ever revamp your range. The stool seat is a stolen idea... I know a good idea when I steal it!
The public ranges get torn up around here, just too many stupid people with firearms...
(Not a gun control debate, just stating facts)
While my tin roof has stood without holes for 20 years, the local range can't keep tin for a month. Some idiot shot the 4x4 posts with a shotgun, so when it rebuilt I used 4x4, 1/2" wall square tubing filled with concrete.