Our center channel speaker is heavy -- like 30lbs -- and I couldn't find a wall mount for it I liked.
This thing is ridiculously overbuilt. You could probably park a car on it.
Aside from the usual malleable black iron pipe fittings, I used some old weathered barn wood with a great silvery patina left over from another project. If you ever need beautiful reclaimed wood and you don't have easy access to unlit backcountry roads adjacent to abandoned old outhouses and corrals, talk to Mark at Got Old Wood. His shop is candyland.
If you DO have access to all of the above, I have a pickup truck and I'm a night owl. Let's talk.