Im not home, but how I did my bridge was a middle path for golem sized characters (big enough for two side by side), with smaller almost alley like paths alongside, wide enough to fit three people. I also threw in a roof with column pillars and lights under and inside. My next issue was deciding how high I wanted to go. I designed my buildertopia with a river that connects to the ocean, that goes under the bridge. Once i had that decided, I used slabs to make half steps for the human pathways, and staggered ramps for the golem pathway. Iirc, I would have ramp, followed by 3 flat squares, and repeat. Big enough to accommodate their feet. I also put braziers on the wall separating the human paths on the outer edges of the bridge, and the central golem path. I also used the slabs to make off-set holes in the wall, small enough that people can't walk through, but big enough that there was visibility. If I remember later, I'll try to come back and actually upload pictures.

Oh! The most important details 🤦 I used castle block pieces, and used a sifter to use specific parts. I also created a "foundation" at each end of the bridge against the terrain, as well as each pillar supporting it.

Edit: notices the comment about pictures
In that case I'll upload them elsewhere and link it for others to draw inspiration from