Can't rep unfortunately...
I am a sucker for Sketchup stuff and this is a nice model. I have seen so many enormous castles, it's good to see some smaller stuff again.
I like the layout of the keep and the floor plans to the right.
One thing though: the windows are far too big for a defensive structure like this. I would put in only arrow slits (going all around the building) and maybe only on the second floor. At the moment it's far too easy for attackers to shoot or throw stuff in. Since there is a lot of wood used in the construction, I wouldn't want the enemy to just walk up to a window and throw in a torch