Hi ellebell
I uploaded Sample maps in RPG Maker MV for better understanding.
You can download them.
The first gif animated image is composed of
FW_A2_V2 SUMMER-for ground
FW_A3_V4 SUMMER -for walls
FW_A4 -walls as well.
FW_B_SUMMER -for trees,grass
FW_C_SUMMER -for props and that (A2 + C_SUMMER rocks)
FW_D_SUMMER-for windows and house
When creating an island, always start like this:
If something is not clear, please don't hesitate to ask.
Kind Regards
Neonpixel