Just so you know, I built my KR the old fashion way - hand laid just like the plans said and I am lighter that Mark L.s KR. I know for a fact that with molds and prepreg stuff I could save a couple pounds here and there but there is a lot of complexity involved in doing all that and I didnt have the time. Now that I am flying I might remake a couple pieces - such as the cowl I just redid.
For the guy interested in heavier KRs - build it light and strong - fixed gear. Plan on 1300 gross with an 0200 or a Corvair and the power will be about right. Ive done lots of flying at 1200+ with no problems. Keep the landing under 4 gs if at all possible. Add a couple inches to the width for comfort and a couple forward and maybe 10 back if needed for legs. With the 2S and the 0200/Corvair weight the CG will be about perfect and it makes a nice flying airplane. My wings are only 7" longer than the stock KR2 - shorter than the 2S and It flies fine. I have option to extend the wings for high altitude and heavier weight since I have removable wing tips. You can build a very nice KR2S and keep the weight right at 700 lbs if you are careful. Mine weighs 710 now and I know I can shave a couple more poounds. See you at the Gathering Lord willing......Bill