The SPA does not take measurements, so if it looks like a Cold Duck, it is a Cold Duck by SPA rules.

The original fuselage had to be pretty wide to fit the old monster size Kraft KPS9 servos. On the new Duck I took ¼” off each side of F2 and F3 and at the same time moved the firewall (F1) back 1/2” to make room for the longer engine. I left F1 the stock width but made it taller to fit the new space. By moving F1 back ½’ it automatically took care of the width adjustment. The ½” off the width also provides the ability to make the fuselage top more rounded. That all worked out well and retained the smooth lines of the original fuselage.

When I changed the span of the stab I kept the root and tip cord the same width as the plan and added 1/2 “ to the trailing edge of the elevators.