couple of people sell micro table saws for hobby use it might fit better where you have no room to spare. one that alot use is from harbor frieght. blade is 4 inches and can easily be stored away.
http://www.harborfreight.com/cpi/cta...emnumber=46379
i saw a neat trick with the formation of ribs with a tapered or double tapered wing where they cut the template for the tip and the root and use a thin bolt to secure the balsa between the root and tip then sand away balsa at an angle to match the angle between the templates. then when you remove the templates you have some finish sanding to get the ribs to have a surface perpandicular to the side of the rib. this is one good example of how to do it;
http://www.airfieldmodels.com/inform...ribs/index.htm