I made a tutorial on modular pieces in my artsation challenge tutorial series, it would probably be applicable to building fantasy environments :) https://youtu.be/xC0uL_QQWeY
Yep, like this http://imageshack.us/scaled/landing/227/exampleofwallswk0.jpg It certainly isnt the only way to do things, but it helps with modular env construction
This looks great already :) Very modular. Also like the grid. Are you doing anything for the foreground? Right now it just cuts off. Or is that now in view?