Very creative! And very sturdy-looking too

I’ve been wanting to set up a way to transport my kid’s bike for days when he takes the bus to school, but can’t take the bus home because of sports practice. But my kid is 11, so the bike is bigger. I’m thinking of something like your setup, but with the rear wheel rolling on the ground. I saw a setup in a blog post that used a strip of metal to make a front axle wheel mount point that sticks out from one the side of the rack, so the two bikes can be sort of side by side. Oh yeah, here it is