I have stoped to work on this project and moved to a new version and architecture. See here:
The project should allow any device on my network to easyly switch beween multiple vpn networks. To accieve this I have decided to use a raspberry pi as a vpn gateway. To allow the easy switching I am adding simple switches corresponding to the individual networks.
For further information visite my project page baumartig
The project is open source under the Apache 2.0 license.