ok, now that i noticed, i am adding a static mesh instance component inside the one i spawned.
that was for the purpose of what they say i need to spawn 1 first before i can spawn instances?..
ill remove that and see what happens…
and one more thing i want to ask…
when creating an actor blueprint.
when i add component, under ‘Rendering’ i can select “instanced static mesh”
so out of curiosity, i created a blank actor blueprint, and added 5 instanced static mesh
a floor, and 4 walls… then spawned a 200 of them.
FPS went down…
i wonder… the blueprint was blank, and the components are instanced static mesh… - confused…
edit:
wait, you were talking about it already - adding ISM inside the actor blueprint…
i will do take a look with what you have and try to learn as much i can with it… 
ps. your work is awesome!! inspires me.