Rafter spray Insulation

I would not allow spray foam in between the rafters.

Roof timbers require through ventilation to prevent Dry Rot.

Fibreglass wool on the ceiling slabs will provide sufficient thermal insulation, and you will only be providing heating to the habitat rooms of the home, and will not have to heat up the huge volume of air in the Attic Void, which is a complete waste of fuel and energy.