Flooring wouldn't be too dificult for that tower Gis...
You could use the rounded floor pieces from set 5725 if you dont mind having small gaps in your floor sections. (Very small gaps...

)
I would like to congradulat you on the construction of that tower,
It is just the type of tower I was hoping to create though I never would have thought of this...
Mind if I "steal" the design? Not that I have enough steck to make it anyway,
But one day...
