^ Actually, Alices are filled with a white custard of some sort, which is probably still (much) lighter than water.
Same math, less approximation: ... volume of 5ft sphere is 1853333.276cm^3. To save you the conversion, if filled with water and neglecting other masses, an Alice of that volume would weigh 4085.900lbs - only about 500lbs less than a small, probably sickly, adult female elephant.
For reference: 1ft sphere, w = 32.687lbs 3ft sphere, w = 882.555lbs 5ft sphere, w = 4085.900lbs 7ft sphere, w = 11211.711lbs 9ft sphere, w = 23828.972lbs
Reimu and Marisa wanted to be put on a spit and roasted over fire as their way to get a tan/ become browned manjuu. Mind=blown. It's like a Monty Python sketch. One of the creepy ones.
This Alice is utterly adorable. I wouldn't mind having one of these as a pet. Although I couldn't possibly afford myself to keep a dosuyukkuri in my apartment. I mean, 1600 kilos? Holy shit.