I had an idea, but I couldn't find the time to do it. >Also, I couldn't
think of any important scenes except the start and the >end. Finally, it
would have been just a bit depressing (martial artists >against a city
destroying beam, no contest)

Get Ranma confident and Ryouga depressed and we could see >how those shields 
withstand Chi attacks...  

	Chi attacks probably wouldn't do the trick.  However under the right 
circumstances, Ranma might be able to use his Hiro-Shuten-Ha to reflect the 
power of the city destroying beam back into the ship.