About #2 airplane:
I have posted in orginal thread what(I think) I know about this plane.
http://www.rcuniverse.com/forum/fb.asp?m=8948071
I do not think it is a modified Mach 1. The fuselage is just to wide and #2 airplane seems more mid-wing then low-wing.
Here is a picture of my Mach 1 bult in winter 1975 (and I flown it for 2 or 3 years) so we can compare. I also added from the orginal thread 3 pictures here of #2 plane. The builder of #2 plane seems to come from Sweden if you read the orginal thread.
/Bo