Over the years I have built 6 of these trainers the Eagle 63 OLd Style and the Eagle 2 New style. At one time the Eagle was the most popular trainer in these parts before the ARF trainers took over.
I strongly suggest you follow MinnFlyers advise on assembling the fuse. even though the parts are supposed to interlock you can wind up with a fuse thats not straight. Follow the kit instructions and use the check off type construction method as shown. Goldberg did a good job on the instructions. I always did mine with White covering with red trim and black stripes. make the top and bottom of the wing so you can tell the difference.
One thing I did notice about building the wings, you should keep in mind. Take your time when covering and keep any twists out. I have helped more then one new soon to be pilot with a heat gun twisting the wing streight.
Take your time and enjoy the project . When you have a question no matter how stupid ask. There are any number of experienced builder/flyers that will be more then happy to lend a hand on RCU