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Custom components questions - accessing guide elements from building stage

Hi all,
I have a question (and more will come probably, hehe) about custom components. I have been looking in the forum and can’t find a reply on this.

Is it possible to access guide transform nodes from the rig building stage (Component class inside init.py file of the custom component)?
I would like to save custom attributes (like a list of transform nodes) from the guide.py and be able to refer to them in the build phase (from the init.py file).

I know I can store the matrices and access them through self.guide.tra[storedName], but this only gives me the matrices and not the actual transform.

Any help is appreciated. Thanks a lot!