Thanks for your reply with regards to the yurt and carriage. We are definitely taking real world considerations into account as much as is feasible. One of our members is actually studying a subject that included Yurts in their coursework so we are very aware of making them seem as functional as possible. The carriage in particular was created using real world designs so would definitely "work". What is missing from the current mesh are the internal walls which will be added later by the people designing the interiors of the carriage. It is also probably not visible from the screenshot, but it also has a lot of nails in it Similarly, the yurts have "missing pieces" that will help with the stability have not yet been added. We will be adding something similar to the below to the Yurts, but again this is up to the person designing the interior.
After a significant amount of work, I have managed to get a number of parts of the carriage into Substance Painter as well as the finished Yurt. They still need textures, but it represents some real progress