Muness Castle (it’s actually a tower house but it is fortified, possibly to protect him form the locals). Construction started in 1598 for a guy who was half-brother to Robert Stewart, Earl of Orkney, whose son had Scalloway Castle built. (I mention them because they’ll probably come up again.)
The bottom level has a wine cellar, storage rooms & kitchen. The first floor has the great hall (shown here). Although less tony then, and more plastered or timber. The private rooms/chambers are in the turrets, and there was another floor above.