AS 1720.1 differentiates between edge and end distances for loads parallel to grain and loads perpendicular to grain. Also between unseasoned timber and seasoned timber. Clauses 4.4.4.2 and 4.4.4.3 refer to Fig. 4.9 for allowable end distances, edge distances and bolt spacings. Some variation is allowed, eg. for loads parallel to grain the specified end distances can be reduced "provided the characteristic capacity is reduced in proportion to the reduction in end distance".

The orange layer between the 80 mm Anticon blanket and the top of the rafters is the foil backing on the insulation. Where it is taken up and over the roofing battens it looks like a separate material, but it's just the foil backing. The layer between the plasterboard and the rafter end is 15 mm plywood. Similarly, under the boxed eaves there are actually three layers of material - 4.5 mm fibre cement to protect the plasterboard, then the 16 mm plasterboard, then a layer of 15 mm plywood. As you say, the layer of 15 mm plywood is un-labelled, but is identified in the BAL-FZ diagram on p.