RE: large DF Bombers
The B66 is a nice looking plane; just the right proportions, like so many aircraft of that era. I've only seen one set of plans offered for the 66, but they were for a small version.
I suggested the B58 because of the large wing area of the plane, since Medman stated he was resuming the hobby after an extended period of time. I also think it's easier to build a strong, low aspect ratio wing like a delta, than those beautiful swept wings on the B66.
Medman:
I was referring to electric ducted fans, not turbines. Not sure how large a model you're interested in, but if the size is reasonable, electric power would be a viable option. When you get too large, electric isn't much less expensive than turbine. Price some large Lipo batteries for instance.
DT56