This is how we created a truly motorhome cinema. Super easy to setup and super comfy.

We use:
1. An old projector that consumes around 60W and costs perhaps under 100 Euros nowadays
2. A TV/Monitor holder that came with the motorhome
3. A sun blocker sheet that you can find for around 20 Euros
4. A cheap ThinkPad with TROMjaro Linux tromjaro.com/
5. JellyFin to catalogue and watch documentaries jellyfin.org/
6. VideoNeat.com - videoneat.com/