Hey Peter - apologies for the late reply. You can use the SpawnControl and SpawnNull nodes - and feed the result as a parent into the next one. To access the parent transform you can just use GetParent and GetTransform on that. for inverse scale you could access the parent’s scale - invert it and then set it as as the local scale on the null.
There are so many options here - and so many ways of how to achieve this. Attached are two images showing how to create a hierarchy with nulls as children. The inverse scale would have to be computed during the forward solve.
I hope this helps,
Best,
Helge
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