the company that services our appliances has the Asto trucks. one of the technicians is a surfer and i always ask him to give me the tour through the truck.
i think for live aboard there would need to be a couple of windows cut in for light and ventilation. the body is quite well made; fit, gaskets, & hardware. big plus is the one piece design = no seems to leak. i don't remember if he told me the cost, but i think it would be a real quick way to "get out there" and modifications could be made over time.