hello there,
yes, it will be quite feasible to build this model in 2mm lite ply. I think the points to look out for would be:
You would have to build the keel up with several layers of lite ply to get the correct thickness, say 3-4 layers.
Also, you may have to double up on one or two of the ribs to make them a little thicker.
Using lite ply for the skin and decks plus bridge would be okay.
I am just about to complete the model of Virgin Atlantic Challenger which is supposed to built using balsa wood. I opted to use lite ply in its construction. This has turned out okay.
Just thinking about though, the advantage of lite ply over balsa for skinning is that I was able to use a 2 part finishing epoxy on the lite ply for the Atlantic Challenger and sand away to me hearts content to obtain the finish on the hull that I wanted without fear of cutting into the timber. Whereas, if you use the tissue/dope method you have to get this on the hull pretty smooth to begin with and you have to be more precise rather than haphazardous like me.
Aye
john e
bluebird