mounting Dendrob & Phal onto 1 large mount

[girly0407]

I have a collection of dendrob & Phal (6) that are doing remarkably well on my window sill behind my sink. Unfortunately, i believe most have outgrown their pots and i have no space for larger pots. I`ve have been wanting to mount them onto something and hang them over the sink in the same window for while now. Fear is keeping me from moving forward. I was thinking of either using large branch of wood (i`d love birch) about 4 or 5 inches in diam. or a pvc pipe totally covered in cork (about 4ft long) suspended in front of the window. Is this a bad idea? am i being a chicken? any better ideas or tips? Id hate to try this and have them die.