I think there is a deeper problem here. As of right now, you can't easily use such templates and experiment with them.
There is no way to select large sections of the ship, move it away, put some other blocks or templates, reattach what you had, shift other stuff a bit...
Your idea is great and I would like very much, to get some templates from reputable shipwright to help me out creating just pale imitations of awesome creations I can see here on the forum, but lacking more tools for manipulating those, I don't know if could do much.