So you want to live on a spaceship ?
Well, it can be done … you just need an imaginative architect & a skilled builder ... & money.
Many spaceships are just realistically too big to build on Earth but there are a few that are possible & affordable.
While quite expensive, the 2001 Space Odyssey "Aries" Moon-lander is do-able within larger budgets.
The Space 1999 "Eagle" transporter would make a nice small home for a reasonable budget. Like many short-stay tourist parks, you could even use shipping containers as a basis.
Install the utilities & foundation pads on your land as usual so your neighbours don’t suspect then build modules off-site & silently crane it in during the dark of night ….. in the morning neighbours wake up to a spaceship next door !!