I don't seem to remember the regulations being quite such a brain twister, then again.
Then again my memory may not be accurate.
So Gateway Station Mark 1 - It Was using a Raspberry Pi. The Software was OpenRepeater which proved to be really easy to configure and the Radio was my old faithful Icom IC-706MKIIG.
True Radio wise a little overkill but we use what we have?
It was all connected via a SignaLink USB Interface and COS & PTT was done via the Raspberry Pi GPIO pins.
Nice clean simple.