Stroller skate upgrade for kinderkraft stroller (not optimal)

This was just a quick attempt to attach the existing design to my Kinderkraft Prime Lite 3 stroller but it's too robust and doesn't steer. It serves just as an inspiration for making another better make.
I suggest making a completely different skate using an aluminum frame with just small 3D-printed parts and steering rubber wheels.

Longer body and 3d-printed wheel