The cowling parts added only 0.4 grams (painted with acrylic) each to the weight of the noseplugs (2.9-3.0 g). However, the plug I formed them on was just a bit too small, and stretching them over the cardboard backs deformed them. So, I think that I'll take them off and do it in straight styrofoam instead. The nose plugs are 1/16" cardboard. The back plug is 2 layers of "cross-grained" cardboard plus a piece of 1/64" plywood. I also put a piece of 1/64" ply on the front of the nose plug under the picture of the engine, which was printed on regular paper. The Plywood was to stiffen the ends supporting the prop bearing (1/16" aluminum tubing, not yet installed, but the hole has been drilled.)
ian

Interesting technique on those cowling.  I'll just wait to see how it comes out.  I may have a new technique for the future! Thanks for all the great construction instruction!  I'm still amazed!

So, the wings are now up to 31 grams each with the nacelles installed. The nacelle to wing pieces are posterboard strips cut at an "L" angle  for attaching the tissue.  I am making the cowlings out of coffee filter paper formed over a styrofoam blank. I stiffened them up with a couple layers of glue. Of course, most of this will be cut off and discarded.

ian

Nacelles look great.  Completely understand the angled former at wing LE.

You can tell that they were counting on wing area to make up for the non balsa structure to get a model that at least the kids could get a decent glide from the airplane! 

Looks fantastic!  I have no doubt that yours will fly too!!!

Congrats! Only 44 years for us, 45 next Christmas Eve.
I should finish some time tomorrow I hope.
ian

I am planning on joining them with butt joints and 1/64 ply shear webs. But the wife says that I have to get the taxes done before I get back to the tedious work.

ian