Go-Frame is designed for spherical mirror projection with fixed planetariums in mind. The scaffolding design accommodates the Go-Vex™ mirror and is basically a stripped down version of the Newtonian™2 projection case. It would be used in a clean environment where the Go-Frame™ system would be basically fixed. There are two model. The most basic Go-Frame has the projector situated in from of the mirror, projecting dirtily on the spherical mirror surface.
The second Go-Frame available is called the Go-Frame™ Plus, where the projector is behind the curved Go-Vex™ mirror and projects onto a secondary mirror which reflects to the primary mirror, much like a Newtonian™2. This setup has a smaller footprint where space is a consideration.
Note that many people swill opt to use the Newtonian™2 projection system inside their fixed domes as the case can be closed after use, protecting the mirror.
Go-Frame Pricing can be found here: http://www.go-dome.co.uk/pricing/