Very nice looking plane, I love the scheme you chose, is it original?.
I've built a couple of the Sig skybolts, they all flew very well. A good friend built a Super Skybolt, powered with a Saito 150, calls it the "black beast" (guess the color). He always talks me into flying it when he brings it out, says he wants to "see what she can do". The real fun is the barbie pilot. I can make her raise her hands over her head with some negative G maneuvers and land light enough that they stay up so she looks like she's cheering.
The Super Skybolt is a
real joy to fly. I can fully understand the grin you mentioned.