Thanks for the offer Brett. I think I've got the labour covered between friends and family.
We got the shed floor frame in today. Need to cut the posts down a bit as I didn't dig to holes deep enough for the posts. Went 600mm deep but the posts were longer. Leveled up the frame on blocks and poured concrete into the post holes.
Test the pier and it fits on the bolts

The concrete was not quite level so the pier tilts back towards the north bit. A few washers under the northern bolts should fix it. Then fill underneath with grout.
Tomorrow I will be painting the marine ply floor ready to install soon.
Thanks to my brother for helping out today