I realize this thread is from one year ago, but I strongly agree with your post Don. I build mostly (almost exclusively) civilian propeller aircraft, and 1:144 is a large part of that. I would love to see an L10, a Lodestar and a B247 in 1:144. A Convair 240/340/440/580 would be nice and a Spruce Goose would be cool too. I love old birds!
Edit: I do have the Convair C-131 that Testors put out in the mid-90's, but there's no scale indicated on the box or in the directions. Mathematically, the scale comes out to be ~1/126, for a CV240. The CV340 has a slightly longer wingspan than the 240 and the wings in the kit are too short for that model to be accurately modeled. Also, I'm not sure this kit is in production anymore, so I would add the Convair to the list.