I attached two 1 x 4 cedar stringers to the interior wall studs in my music room with
spax screws. I installed several adjustable wall hangers to the stringers for a total of14 instruments hanging up in my temperature and humidity controlled room. I've got fiddles, mandos, guitars and some heavier instruments (26" scale carved archtop 10 string mandocello, resonator banjo) with no problems now for three years. I'm confident this would support a full metal resonator guitar. This is the most compact and easy way I've found to keep multiple instruments in optimum conditions yet ready to play at the same time.