Freestanding, arched Pergola (with two posts)

Materials for a freestanding, glue-laminated timber arched Pergola

9 rafters 5 x 9 x 63cm
4 support struts 9 x 9 x 63cm
4 glue-laminated timber arched bearers 2,7 x 9 x 214cm
3 upright posts 9 x 9 x 240cm for inserting into post anchors