I would say that ship research should be something like 150% of the cost of the ship. That way it dosent cost the same to develop a light fighter as it does a huge dreadnaught. Also what I am the most interested in is if we should allow development of new tech like weapons and such, but with an expensive research fee.
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Out ride the sons of Terra,
Far dirves the thundering jet,
Up leaps the race of Earthmen,
Out, far, and onward yet - Robert A. Heinlein, The Green Hills of Earth