Six? My goodness.
I know that Armidale and later boats have different superstructures around the Bridge area and I have done a drawing of the differences, from photos, so I can build Ararat. I am happy to send copies to builders.
Glenelg also has different engine exhausts that are very noticeable.
Derek, The motors were fixed in position on 4mm. stainless steel bolts fibreglassed into the hull but were removed so I could work on the deck and superstructure without damaging them. The photo shows the first layer of fibreglass mat over purpose made washers to spread the load. There is another layer over the top.
Hopefully the shafts are parallel on the full size and in my model.

Mine is a slow build but I try and do a little bit each day.