Thanks to my patron Dennis who providing the reference for middle shaft symbols, I did my best to make a trace to it and this is how the whole trident looks like. The Trident sculpted in Zbrush and is ready to prep for 3d print ready soon and all patrons in this tiers will be receiving the download link to the 3D model, Cheers!

The Trident I set the default length at 72", you might scale from here to fit your height if necessary!