L115A3 CES / Key Parts

I have recently acquired an AI AW 338 that I want to build a L115A3 clone with but I am struggling to find good details online of what the key components are to make a correct build.

The bits I know I will need are:
MK2 S&B Scope (this is quite low on my priority list at the moment)
SIMRAD Interface Scope mount (already have one)
Harris bipod - I don't know which is the correct variant
Handstop - is this the AI handstop with sling swivel or something else?
Cosine indictor (already have one)
Cosine mount - I believe sporting services sell these but I don't know if it is the correct variant
The block that interfaces with the bipod spigot hole that the STIC thermal mount attaches to
STIC Thermal rail
AI .338 mod (I have one)
AI Green 338 mod cover (I think I have one of these but not sure if it's correct, I have attached a photo)
Bubble level - I don't know the details of the correct one

Is there anything else that is core to the rifle I'm missing?
I know there will be auxiliary bits like carrying cases and other bits but my focus at the moment is to get the rifle set up then go after the extras.
Although any further info such as CES lists or anything like that would be a fantastic help!

Any help is much appreciated.

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