No actually it's a scale model of the civil warship merrimac... or was that the monitor?
The four bosses on front and back, accept 1/2' diameter round acrylic struts to support the tuner above the drumhead.
On the back I use two struts in the two outer bosses, on the front I use shorty struts in the inner two, to bracket either side of the lug being adjusted.
I am down to using only one mic, but still two speakers.
The part is a symmetrical clamshell so two halves mate together. Smaller, lighter, cheaper, faster, better...
JR