I achieved to make a frame specially optimized for the schlieren mirror, in order to hold it up with a clamp and keep it nice and snug. The frontal pieces of plywood were used instead of wood to maximize the amount of light refraction. The biggest difficulty in achieving this first step was building the frame, without bringing the mirror into the wood shop (to avoid it getting dusty and damaged). It was a nice surprise to see that it fit perfectly inside its designed space (with a millimeter accuracy).
Process sketch:
Then I proceeded to setting up the schlieren mirror at a focal distance of about 2 meters. The image below shows my point light source (a flashlight covered with metallic tape) and its refraction at a distance of about 5mm from the original source. Today I will proceed with the razorblade placement and first trials.