[Updated]Invisible AMFP meshes? (And Other Questions)

[Daemian]

1) Any tips on multi-story houses? I never made them in my first CS but now I'm trying to and finding that working on the first floor (Or ground floor if you're british) gets a bit hard once I've started working on the upper floors.

I would make several small levels connected by a hub or main hall.
Way easier to handle. When the players walks up the stairs, you load another level.

3) Is there a way to create an entity at another entity? I know you can create one at an area, but I want to have the player pick something up, then while they're carrying it, it breaks and some rats fall out of it and scurry off. Is this possible?

I tried once but I couldn't.
Although, I know you can have another entity when you break another. Check the key_jar entity, it becomes key_jar_broken.ent

Another option is to have it planned where the rats are gonna spawn. Then with an area you check for the item when it enters and you trigger the event. Spawn rats+break item.