Gather the arches and ladder sections

Glue the ladders into one side of the arch as shown above

Glue the other arch onto the other side of the ladders

Glue and slot the lower ladders in from the bottom of the arches

Glue the feet onto the bottom of the arches

Flip the gantry over and glue the platform onto the peg on the top of the arches.

You are finished. Prime with Rust-o-leum Profesional Enamel flat black and paint as normal with hobby paints.