Hello Fabian,
I am Exepcting to have around 40 switchs 3810, Also in each switchs will have LSA1 , 2 and 3.
I know that there is a lot of information online, but it depends also on type of Hardwar to size the number of switch per Area
they will be connected across VPLS, it like HUB and spoke Architectue.
on HUB and spoke based on what i read it said it is required to put spoke on NSSA
Thanks