Infinite Canvas No. 3 - Troubleshooting

I recorded the first two stages of what I was hoping to be a four-stage drawing process.  After two stages, however, I realized a problem Hajoe (head of my MFA program) mentioned: how are you going to know where to connect/not overlap with the other projections that are drawing before they make the marks?  The answer is either a very well planned out, choreographed performance or some sort of extremely light drawing to mark some cues for myself.  I'm leaning towards the latter, as I don't want this to be a staged occurrence but a truly generative drawing process.  I'm hoping to get feedback on this:

Testing out asymmetrical drawing.  What's the best way to get a third "Brick" in there?