How to draw in 3D (more like a CAD software ) on top of an STL 3D model I loaded in the scene?

Hi all, now I have loaded an STL 3D model and I want to do some CAD on it or at least put some reference points on top of the model to use them to draw a line later on and then maybe extrude it ? So basically something like web based CAD software. So how can I do this ? Details are much appreciated since I am a beginner. Thank you we are in public beta right now so you can request access. This is a real CAD system which you can drive by code. It’s tied into three js on the client.

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Sounds great, how can i get access to it. Any documentation?