Jim, around 5lbs is what I'd expect for a forty size plane from that era. I'm not sure what I did to reach 3.5lbs other than select light balsa. I'm also convinced that dope finishes are very light. Maybe by scaling down the sixty SK to 52" I got a lighter model, who knows? Maybe the Jr is built differently (heavier). I can't imagine the older radio gear would weigh 24oz more.

Bob, thanks for the tip. I found a guy who has the vinyl masking film. He claims it works great so I'm giving it a try:

http://www.customcutgrafix.com/