My dad was a welder and one-man band. He welded an ingenious stand which held his mando, fiddle, and banjo. It was not lightweight, but he could still carry it in to gigs on his own until he quit going to them at about 85-86 years old. It had a middle vertical bar round which there were three hanging pegs/brackets for each instrument. While he was playing one, he could round robin that stand, getting ready to hang up the one instrument he was playing and pick up the next.

We never, ever left our fiddles out, but I do remember his guitar and banjo being case-less, always. Out here, I'd be too concerned about one drying out and cracking were it kept out. Good luck, regardless!