Hi buddy
I can help and give assistance for this application... all of the advice so far is sound (except Danny’s original post - just no comment... at least he removed and sorted in the end), and your comments ref timber well founded...
There are various options: timber or inert noggin within the web and fix a render carrier board to these. Or external grade or aluminium encasement clips and profiles, then fix the boards to these
....or... full fill and wrap the steel with insulation (bonded and pinned), then render like an EWI - although I expect you only want to have a board and finish underneath for the opening below...
If timber, use tantalised and you will need some sort of ventilation in the cladding to keep moisture or dew from building up on / in the metal web...
Get in touch if you like
Richard Lord
Knauf
Aquapanel Technical Manager
07918 766577
Rlord@knauf.co.uk