As I have started making my own sci-fi figure and alien creatures, I thought I would have a stab at buildings, too.
I wanted to make something that was not Gothic- or desert-themed, but that was also modular at the same time.
I came up with the Modular Habitation Unit (MHU for short - pronounced 'moo').
These MHUs are made from three core bits – end modules, door modules, and window modules.
The small MHU is just a door module and two end modules. The medium MHU is a door, one window and two ends. The large MHU is two ends, two windows and one door module.
My idea is that the OKI Corporation takes customers' orders based on what configuration they want, fly the modules to the colony world, and then assemble the alloy polymer modules and add the O-Krete which covers the modules' skin - and whilst that hardens, they go inside and connect the plumbing and electrics and so on. So 36 hours after they land with the bits, they leave the planet, having installed a fully operational, secure, safe place to live.
The OKI corporation sell these MHUs to other companies that are looking to relocate employees to a new planet for commercial reasons. However, they are now selling these to the public to fill the gap where private co-operatives are forming their own small colony projects.
I figured if you want to colonize a planet, you don't want to have to start making quarries to get the stone, you don't want to make a metal works to get the steel. You don't want to have to take courses in plumbing and electrics and house building. You would do what you do now - buy a ready-built house. Only difference here is the OKI Corporation delivers the house to you!
The solar panels also mean less worry about fuel needs, too.