It's not really fragile, maybe beacuse the walls are 3 "legoknots" wide
A video I made before the bridge and bridgehead was completed (notice: as soon as I removed my hand, the tower stopped shaking imediately ). A strong wind can't overturn it, but a nice kick can, probably like all other castle buildings It's 240 centimeter tall (according to google thats about 100 inches - don't know how many feet that is - but it's about as high as the tallest basketball player )
It's divided into 5 sections, so I can easily move it. 2 of them has interior. I guess i was a bit eager to show the tower to you, before I was finished with the interior But I'll finish the other 3 soon enoug
A picture from the throne room: