The updated bridge model now consists additional cris-cross members and represent an arch-reinforced Howe truss concept.
fourth pole at the base of the main arch after input from Andry Widyowijatnoko (RWTH Aachen/ITB Bandung):
Finally the model finished. After three boring days (making holes) and inserting nails. Push nails being used in the model to mimic the bolt joints in reality.
and the sturdy study model passed the load test ...
point loads (left) and distributed load (right)