Laura...another job well done!
M...that's a GREAT piece to do some orchid mounting! I love it! If it were mine, I'd try to plant 4 different orchids, each with a separate bloom season. That way, hopefully, something will always be blooming on it

Please let us know what you decide, I'm looking forward to seeing pictures once you've got it set up.
From my own experience, just make sure you choose 'chids that take the same type of lighting.