The solar design t-square and a Method for designing reflectors for unattended solar cooking

Step 5 How to set up the lasers and model

Here we have a big grey area.  Depending on your skills and equipment, you can either set up the lasers above the model and just have them going up and down like  a microscope would. (and mostly move the model as you do your adjusting) or you can leave the model stationary and have the lasers doing all of the movement.  You could even have the lasers attached to the edge of a sliding shelf.  It slides out so that the lasers can be above any point on your model.  The lasers must be able to move along the edge in this setup. Also, the lasers must be able to slide apart a little so that the intersection can move up and down and you can "focus the dot" on your strips of reflective material.
I include one drawing of how it can be done with the "sliding model" and I will add a diagram of the "edge of sliding shelf" concept later.  (Just 2 different ways to achieve the same result).
I do not know which will be best in the long term.