I have successfully converted a Control:15 to become a full touchscreen Roon controller and audio endpoint. Tested with Roon 1.8

There is no need to change out any hardware - everything runs successfully on the original hardware (for performance - change out the hard disk for an SSD).
The only functionality lost is that of the CD drive.

If anyone would like further information, please feel free to PM me.

Cheers,
Steve

Main: 861v6 (LPS), 808v6, UHD722, DSP8000SE Anniversaries, DSP5200.2HC, DSP7200.2, SW1600, Sky Q, Cambridge Audio BD, Roon, M80
Office: 861v4 (LPS), 818v3, 800v4, HD621, M&K S150P, DSP5500HC, M&K MPS2810 sub x2
Son's system: 861v4, HD621, DSP6000.2, DSP5200HC, DSP33
Spare: MCD, 100 Series, 200 Series, 500 Series, F80s, C15s.