John, the balsa cubes may be used to mount the cowl or a hatch cover. With out seeing the parts it is difficult to determine what they are and where they may go in the construction. I recommend you contact a club member or a local hobby shop, show them the parts. Also, you should look in the forums for constructions threads on this site and maybe RC Scale Builder.com. These construction threads are a great place to ideas, most post pictures of their build.

Good Luck
Rich