Sheeting & Insulating Shed

G'day guys.

My local not-for-profit organisation has a club shed, within one wing of the shed is a 55 sq m room used for dining/sleeping during weekends when we hold events.
We use a pot belly stove for heating but during winter the temps can drop below zero overnight.

I'm trying to find out what would be the most cost effective way of sheeting and insulating this room of the shed (as well as a cost effective way of supporting said sheeting).
The room is 8900 long with a 75x40 RHS stud every 3 metres, backed by top hat channel running horizontally at 450 and 1800 off the floor into which the shed wall is fastened.
Link to photo

Obviously these spans are far too long for sheeting, I was thinking of either implementing a timber stud wall or adding more hat channel to the required spacing for gyprock (although I assume hat channel would require additional vertical bracing).

If anyone has any advice on a more economical or efficient way of sheeting this wall (or even a different type of cladding that could be used) I would hugely appreciate your input :)


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