Decided on the NUC6i5SYH, little price advantage on buying an earlier model.
Installation observations: Only issue I came across was after the 2nd boot from the Clover Installer:
5. Clover bootloader screen shows up, select "install_osx" as you did in step #2 (your OS X Installer partition, not your install target partition).
6. Install screen will appear and continue installation. This time, installer will install files to your target partition and create Recovery HD partition. This will end PHASE 2
At this point you need to review and accept licensing again, but before I could complete this the NUC rebooted (Panic?). On the 3rd attempt I did this as quickly as possible and got through it, there after all went well.
Post Installation: Whilst generating ssdt there was a warning, "cpu-type" may be improperly set, (0x0605 instead of 0x0905), followed by a further warning that the board-id was not supported by Skylake. I removed the board-id from the SMBIOS using xcode but the warning persists. Not sure if I have to do something else to permanently remove this value?
<edit> tried various board-id's. If I put a correct one for a Skylake iMac then I get a mismatch between model and board-ID, otherwise for a good Board-ID for 14,2 then the error above. So i assume as there isn't a Skylake version of 14,2 we are snookered </edit>
Tested: Bluetooth OK, Audio OK, and AirPlay to Apple TV works too.
Dual boot to Windows also working.
Thanks, this is an excellent little server.
Installation was El Capitan 11.4, will update to 11.5 this evening