Hello and welcome,

Your project is interesting.
There are surely constraints related to your country.

Here are some remarks:

1. The toilets outside, why?
How do you do in bad weather?

2. I did not see the bathroom.

3. I do not see how the big balcony will fit.
You can not put a beam in the middle of the parking!

4. No window in "main bed".
no window in "bed small".

5. How will your roof be?

6. How will you heat your house?

7. What does OTS mean?

Regards,
bdfd.

[:)]