Back to simplicity, just purchase a used Surface 3 (non pro) 64GB 2GB, for USD75 not fast enough for web surfing, but fast enough as Roon Endpoint and Display, by using the 5GHz AC WiFi, no dropout even DSD512 playback. The cost even lower than Raspberry Pi with 7” Touch Screen Solution.
Surface 3 just powered by 5V Micro USB, and by updating its BIOS with Kisok Mode, you can keep it plugged to USB power all the times at 50% capacity that keep the battery cool and long life without overcharging.
So my bedroom system as simple as：
Lenovo M93p i5-4590T running ROCK
Surface 3 x7-Z8700 as Endpoint and Display via 5GHz AC WiFi
and USB connection to Cyrus 82DAC QXR integrated Amplifier with QXR DAC Card (768K PCM / DSD512) and PSX-R2 PSU
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