Yes, if you start off correctly. If you are not level and plumb to start with you will get all sorts of problems at the end when you get to the roof.
Yes, but if you are going to custom design you are looking at around a 25%-35% price increase to the closest Standard Design.
All days are calculated having 2 carpenters on site every day.
Class 10: up to 25 m2 is around 4 days.
Class 1: up to 25m2 –is around 7 days.
Class 1: up to 40m2- is around 15 Days
Class 1: up to 70m2 – is around 20 Days
If under 10m2 yes. Also if 1.0m from the boundary and the wall height is not higher than 2.4m, and the apex no higher than 3.0m.