The panel screws to the ceiling- takes about 5 minutes to do. Repti-Racks sells Pro-Products RHPs which they will install for you.
The only problem with Repti-Racks is the lead time.............as for adding vents, call Steve at R-R and just ask him to add the extra vents.
Womas are very curious and will nose, nudge and mess with heating elements. A CHE with a heat guard will take up most of the cage. The good thing about a RHP is that the snake can't burn itself on one.