Any more info on the mods to your unit? I'm looking into potentially having the unit modded as well (I had my old Musica extensively modded with a Superclock upgrade, better power supplies and connectors, etc.), this time probably with the VSE Terra Firma Clock upgrade (if it will fit).
Also, regarding the ease of hard drive replacement, that might not be as easy as you think. At least in the older products, the EEPROM of the unit stored the serial number of the hard drive, and it wouldn't boot without the drive matching what's stored in that EEPROM value. If you wanted to swap out the hard drive, you had to download a hack that was floating around to reset that value, and it would read and save the serial number of the hard drive connected on the next boot. I do wish the latest Olive units were a bit more "hackable" like the old ones, where you could access the unit via Telnet or SSH.