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Darn! What a twit! I got the end caps round the wrong way! Bugger- well if you lot are not smart enough to figure them out, that's just too bad 'cos I'm not taking another photo. :-)
The unit is 17" long, ballast tank = 4.5" long
It says, it's for a Skipjack. I guess it was for the 1:96 model David used to produce. I have a hull too with most appendages. Lets say $200 for the Sub-driver and $140 for the GRP model.
I actually have THREE of these Sub-drivers. The second & third are 16.5" long - also marked Skipjack.