This photo appears to answer my question about the steam pipes:
http://www.cerberus.com.au/fdeckbow.jpg
It seems that in addition to the pipe aft of the funnel and offset to one side (as in the paper model) there are two pipes forward of the funnel, one the same size as the aft one and the other shorter and narrower.
Another interesting detail visible in this photo is the signalling semaphore (the sailor is standing next to its base), and the searchlight platform (between the ventilator and the funnel) which seems to be missing from most plans and models of the ship, though it is shown on several photos. I believe that it is positioned above a skylight.
There's a lot of useful information in the Image Library at
http://www.cerberus.com.au, including some good photos of the Nordenfelt guns which will be useful for anyone attempting to scratchbuild these.
I have a question about this photo,
http://www.cerberus.com.au/cerbdeckrifles.jpg - It clearly shows covers (grates?) on the forward skylights instead of the elaborate "faceted" glass covers usually seen. As most photos show the glass covers, I'm guessing that the solid ones were installed when at "action stations", to remove the danger from flying glass fragments?
As the glass covers look like they'll be a serious pain to scratchbuild, I'm definitely inclined to build the skylights with the solid covers as shown in the photo!
I also have a couple of questions about the single mast fitted to the Cerberus in its post-1885 fit:
- Was the mast fitted into the boiler air intake structure? The mast is fitted at the same location as this structure, but plans and photos do not clearly show what's at the bottom of it. The one photo I have shows what appears to be a large vent cowling in the position of the air intake, quite different to the original fitting which is a rectangular box with a cylindrical intake on top.
- Was the fighting top made of solid metal sheet, or open? It definitely looks solid in photos, but this could be due to a canvas spray shield? This contemporary drawing:
http://www.cerberus.com.au/nord5intopcleancom.jpg shows a wire mesh structure with a wooden floor. (I think this is a generic representation of a fighting top and is not specifically meant to be the one on the Cerberus)