CAP 232 40 engine?
I am sure 5lbs could be done, but it would take a lot of chopping and replacing to contest grade wood in some places. The wing there isn't much you can do on the wing ribs, because they have already been lightened. So you have to work on the fuselage.
You will be able to take out all the wood under the canopy and then cover over it.
Fuel tank platform, carved out to be lighter, and a few formers, sanded down. But there really isn't much to ligthen. But I think it wouldn't be to hard to drop a couple of ounces though.
I have pieces of the fuse, in my attic, when I get a chance I will post some pictures. I have the entire fuselage except the first 3." right side of a wing.
I paid to have my cap built and covered. the guy that build it, is a great builder, but he doesn't chop out much wood.
I would really like to fly this plane, to see if its a good plane or not.