My US60 built from the RCM plans came out just over 8 pounds.
The original construction article specifies 7-7 1/2 pounds.

I made no attempt to build light. In fact I probably over built
in some areas. OK...maybe in a lot of areas. So getting down
to 7- 7 1/2 should be no problem.

Lots of weight in that tail with all that 3/8 inch wood. I think
selecting lighter wood in the back and going with a lightweight
motor will go a long way.

Even as heavy as mine is it flies like a dream and I have no
problem flying the Sportsman sequence with it. Not that I
would ever compete but I think this plane would do very well.

Mike Hammer