What's so ridiculous about Dooku's ship? You realize the solar sail is scientifically accurate to the real world, yes?
So is using millions of feet of kite string to suspend a sail boat. Just because it's scientifically accurate doesn't make it less goofy. If you want a better use of a ship that uses solar sails even though it takes place in a universe that has much more efficiant methods of teval, watch Star Trek: Deep Space Nine's Season 3 Episode 22 episode "Explorers". The solar sailor in that episode is a million times cooler than the one Count Dooku used.