Once I got my scroll saw, I don't know how I ever did with out one! Mine sure beats my old method of cutting 1/8th" 5 ply fuselage formers with a coping saw! Plus, I can undercut my maple motor mounts in the fuel tank area, cut tensioner spars to mount bellcranks, cut plates for removeable LG etc., etc.. I don't really know all the uses I have!
One thing I like to do is cut very shallow kerfs, about 1/4" apart, in the side of the maple mounts where they will epoxy to the ply (or balsa as the case may be) which just gives a better tooth to the epoxy bite. I use the distance from the blade to one foot of the guide as a gauge for the cuts, maybe 1/64th" deep.