I have been wanting to build this model since i saw it in rcm 35 years ago,I now have the plans and foam cores as well as a set of kdh retracts that match the cas retracts on the plans.the kdh struts are about 1/2 longer than the struts shown but since i fly off grass will go with the extra length and just move the wheel wel.I will be using a hb 61 wth pdp for an engine.I was planning on building this stock per plans but am now reconsidering enlarging the stab and elevater as you did.My question is does the new cold duck fly better than the original due to the increased power and less weight or does the enlarged tail really help.since you flew the original what do you think.I will be using polyurethane and glass cloth for a base for paint instead of monokote and am shooting for a weight of under 6 1/4 pounds.