The bridge that goes across the the pod area at the front of the dash can stay if you are using the G28 pod. If you are using a 2 piece pod (like OEM) the bridge needs to be removed.
The left side of the dash is the wrong angle to meet up with the pod, so that needs to be fixed, along with the area for the 5 button switches.
The dash mounts at the leading edge (where it meets with the defroster panel), on the sides of the dash, and where the upper and lower dash pieces meet on each side of the pod.
I know whay you guys are thinking right now,....."what the heck is he talking about?"
There is alot of work that needs to be done to these dashes before they can be installed. If you have one, you know that its just a basic piece of fiberglass with no mounting/mating flanges, and no way to attach it to the car. I will see if I can find some pictures and modify them to show what needs to be done for mounting.
Remember though, theres no point mounting your dash untill your doors are done. You need to have your doors done in order to mount your door cards on them, and get them in the right position on the door. Once that is done, the dash can be fitted to match the door cards, shifting the dash side to side or back and forth to match up with the cards and get an equal gap on each side between the dash and cards. It cant (and I mean impossible) be done the other way. The door cards only fit in one position on the door, they cant be shifted to meet up with the dash.
Always remember (always!) to allow for your upholstery thicknesses when fitting unupholstered (fiberglass) pieces.