I did the same with a projector and an old Mac Mini. Upgraded the internal hard drive to a small SSD and hung an 8TB spinning HD off the back with an attached Blu-Ray drive. Has the benefit that you can do things like rip / play Blu-Ray discs, choose to use Netflix / Amazon Prime / Apple TV / Eurosport / whatever you want. Only downside is that the Mac Mini is so old now (> 10 years) that it doesn't get OS updates. But I'm not sure I care about that too much as long as it works, because I have no personal data on it.