Cool project!
Here's my 2 centavos worth. I like to build as big & light as I can and still accomplish the mission. Me? I'd try for 200 sq. in and 12 oz. or so. My little KwikStik 010 has 121 sq. in. and weighs a tad under 5 oz with a single 010.....it flies with authority! Your Skyrocket wing would have to be scaled up in relation to the fuse & nacelles to keep the overall size & weight within reason. My brain power doesn't go much farther than a rough idea; then I start drawing in CAD, scaling the parts up & down 'til it looks close enough. Then I try to engineer all the excess weight out of the structure I can and see what comes out!