Model Shipyard - HMVS Albert
Labels: Victorian Cavalry
You can see the still extant wood door frame here.
In my opinion, Sites #4-6 are especially worth investigation. Sites 1 and 2 are probably post-Federation, but the form of their construction is not like the slab-sided ww2-era buildings that may be seen at Point Nepean, but rather more like the structures at Fort Nepean proper which mounted the various QF guns. I have not yet seen anything like them mentioned in my reading and a further literature search will be needed. If I had to make a guess, I would think they were from the 1890-1914 period.
More images as I Photoshop them into submission!