Everyone,
Thanks for the compliments. I agree the "full hull" ship would be much larger than what is seen in first three movies, although the production designer never finalized anything because it wasn't required for the script. I do know the same ship prop was used in all three movies. I think it was used in the short lived POTA TV series as well. The full hull ship design has been speculated by fans for decades.
Interestingly the resin model company Fantastic Plastic has just released a 1/72 scale "full hull" Icarus. You can get it on Ebay (about $125.00). There is another resin kit company called Crow's Nest which is about to come out with a 1/48 scale Icarus offered in two versions.
I still think the design and shape is really cool even if it was only partially developed.
Phillip1