I created this guitar stand as a "under $10" secret santa gift using some leftover plywood and stain. Most of the actual cost went into the hardware.
Step 1: Trace and cut upright arm
I used 3/4" leftover plywood for the stand. Trace out template for upright arm & cut with jigsaw. The front to back dimensions were approximately 2x the depth of an acoustic guitar. Height was enough to keep the guitar off the floor from the headstock down.