Nick wrote:

A rough calculation gives 130,000 roof tiles. That's a lot of small spaces.

Possibly a bit *too* rough ;-) I think of a rooftile as being about a
foot square; let's halve that to (over-)allow for overlap. Your palace
then has a roof area of 65,000 square feet - let's see, 80x80 is 6,400,
which would be a large-but-possible house (say a 20x20 yard footprint,
wot with the roof being sloped), but 65,000 would be square-root-of-10
bigger on each side, so maybe 60-70 yards square. A not insubstantial
building plot, but house-wise getting on for Footballer's Wives
territory ;-)