The D2 build.props are missing all of the code to start GSM.
It is much easier to use a D2G build.prop.
To make it read correctly in system>settings>about phone try the following:
1. Open root explorer and Navigate to /system
2. Mount system as RW
3. Long press build.prop and select edit with text editor.
4. Near the top is a line that ends with = D2G_Romer, replace "D2G_Romer" with the name of your build.
Liberty uses build.prop for a cross check for their toolbox. It will work, but may give you an error.
Also, Romerv3 will not automatically install Libertytoolbox. For now, until I upload v4, manually navigate with root explorer or file explorer to /data/liberty/app and install the apps in that folder. As far as I know, Liberty is the only rom using a custom startup script that installs apps from that location.
D2G_Romerv4.zip is currently being uploaded.