Transform coordinates

Hey there.

I’m pretty new to dynamo and I’m trying to schedule coordinates from a plumbing fixture family. Now, I get X-Y-Z coordinates but what I need is to get the spot elevation so I’m trying to transform XYZ position points in the Survey Point coordinate system… unsuccessfully.

This is what i got so far:

So maybe anyone could point out what I’m doing wrong…

Sorry for any mistakes. English is not my native language

Hello…if you want the spot elevation as absolute, you can try this…hope is what you want…

I’ll try to work with this.

Thanks for this!