It's hollow, but the back part has a small wall at the bottom which is about a foot tall.
Yes for best stability sink should be mounted to wall after placed on Pedestal. Make sure to use rubber washers on the screws to avoid damage to sink.
The height will vary based on the sink model.
When installed, the pedestal should stand a few inches away from the wall. It's to allow access to the pipes/valves behind it.
yes, do to limited space best to do as much pre tightening of the drain connections before installing sink onto pedestal.
It should be used with the Glacier Bay Shelburne pedestal sink basin.
No. The pedestal has a 4 1/8" diameter hole at the floor, and a back wall up to about 9". The actual base is 9" wide, 6" deep, and with the matching shelburne sink it mounts about 6" away from the wall.
No it's not it more like 27.75 inches
Had the same issue, because the p trap was too low. Either you have to move the pipes, or cut out a small piece from the pedestal's back.
The p trap will be hidden but not the water lines.