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> I like your cable-drive concept by the way. Did you describe it in more details anywhere?

I didn't take the time to describe the cable-bot concept in detail.

I modeled almost all the mechanical parts with OpenSCAD, but I struggled to model the cable itself.

In the "mechanics" README [0] you can click on any image to view it in an online 3D viewer.

The following note in the same README tries to explain how the cable is used :

    Each cable is actually wrapped around the motor axis, then passed through the pulley and tied to a fixed ring in the corner of the panel.

English is not my first language, is this sentence clear enough ?

You can see these elements in the main 3D viewer [1]

> How are you getting the right mirror orientation for each mirror (aka canting)?

I use one bolt that pulls the mirror holder in the center and 3 bolts that push it in the corners.

By screwing or unscrewing the corner bolts you can precisely orient each mirror independently.

The "panel_board_exploded" view tries to show this [2]

> One trick for closed-loop control with many heliostats/panels is to have a few cameras surrounding the receiver.

Super clever, thanks for the explanation!

I think it might be tricky to calibrate.