I've thought about the same kind of thing. I registered Dirigibuilding.com several years ago because of it.

One of the best things I see about dirigibles vs other aircraft is that volume is plentiful. Because you want to minimize weight vs size, larger rooms are better. I imagine a floating mansion rather than a floating van.

That is a great domain name! You're right about the room size, I suppose you would have to keep it either in the air or parked in nature when it's that size. Damn it, I want one even more now!

OP has mentioned a 60ft version of their autonomous airship would be in the neighborhood of a couple hundred thousand USD.

Thank you! And that would hold around 2 tonne if the weight scales up linearly, or is it cubed? Either way still cheaper than a house here in Australia

The final one we're building will be 60 feet and have a 650lb payload, so would have to be an ultralight house! And you'd also need a place to park a 60'x20' airship. Or I suppose you could just keep it in the air? There's actually a startup that's supposedly building air yachts like you're talking about. I forgot the name but I think they're 150-200 feet.

Thanks for the reply, yes I believe they are called Airlander

Rich people spend $200,000 to $300,000 on bus/coach size giant RVs, or 55-foot catamarans, so that's not beyond the realm of possibility.