If anyone is interested, I have created a walk through guide for Diet Pi which:
- Installs Roon Extension Manager - an easy to use way to install and managed community developed Roon extension
- Installs Roon Web Controller - a responsive web remote for Roon
- Installs and configures the Chromium web browser in kiosk mode
- Installs the Roon Bridge software
The guide is available here: Diet Pi Installation Extension Manager