AT-ST Parts

[MonsieurTox]

Hello, I'm building the SS AT-ST, the head is almost complete, I did some tests with the legs, but I would like to know if someone knows more about the kits used by ILM on the original prop...

I would like to know where this parts/area come from :

The barrels of the main cannon
The octogonal parts on the domes
The greeblies on the legs
The toe of the foot

If you have some clue, it would be a great help . Thanks

Tox