Yep, that's how I'll be doing it.
Just ordered M10 Stainless all thread and Muti-se Vinylester (simliar to Ramset 801) from my favourite online supplier.

thanks for the reply Ardo. have thought about using chemsets as you suggest, would be easier to plumb and would be securely fixed during construction.

I'm about to start erecting a Patio/Carport kit, 4 mtr wide x 5 mtr long.
The 90mm x 2mm rhs posts attach to the baseplates as per my pic.
Baseplates are to…