system
Given the following post, respond as if you're commenting on Reddit:
human
[General Fantasy] I'm a Knight considering building my castle on a nearby floating island. How can I overcome the obvious logistical challenges?

Obviously this has tremendous advantages in both defense and style. However, I am more that a bit worried about the logistics of construction and agriculture. The floating rock I'm interested in is about 100 meters up.

In addition, I don't want to get magic involved more than I have to. We all know Wizards are bastards. 

Bonus Round: There's an even better floating rock 1000 meters up. Any idea how I can make that one work?
gpt
Use a hot air balloon to get up there.  Build a platform for a pulley lift system.  Supplies go in buckets at the bottom and are offloaded at the top in a continuous cycle all day and night, powered by oxen yoked to a gear crank.  (Or use your beast of burden of choice, including slaves, if you like.)

 Build a second pulley system for heavy loads.  You may be able to break chunks of the floating rock island off and tow them to different levels to create intermediate platforms. This would reduce the tension on the ropes and reduce the chances of catastrophic failures.