What am I???

[Craig52]

Red brow?

[Brooksy]

Not a Red brow. This bird have never made a nest that you can see the chamber from the entrance, there has always been a tight turn from the entrance to the chamber.

[Brooksy]

What nest is this?

I would say painted firetail. Craig

This actual nest is directly under an occupied Painted's nest

[SamDavis]

I'll try Beautiful Firetail (given your avatar).

[Brooksy]

I wish but sadly no

[Craig52]

Pictorella? Craig

[Brooksy]

No, did you want me to give another hint?

[finchbreeder]

From the description of how they build I would say a Cuban.
LML

[branchez]

Fire 'Ruddie'?

[Brooksy]

Not a Cuban. You find them in Queensland and subspecies in Papua New Guinea