I went with a stringered (aka cracked rib) wing design, which worked well. the wing passes through the fuselage with a cut-out in the spar to give clearance for the rubber motor. The structure is mostly 1/20" square balsa with 1/32" fuselage formers.
The model was covered with Martin Dilly's Japanese tissue and finished with a coat of banana oil. Note the rudder is hinged using soft wire to help with trimming.
Use the lightest clear sheet you can find for the rear glazing - I cut mine from a window in a cake box. The cockpit canopy is plunge moulded.
The model used a Tern 6" plastic prop cut down to 5" and scraped with a knife to take about 1 gram off the weight. With this, the model balanced at the point shown on the plan without needing any nose weight. The undercarriage is modelled in the drooped in-flight configuration to allow an ROG with a 5" prop. Initial flights were made with a loop of 3/32" rubber giving an all-up weight of 14.7 grams. I am happy to report that the model flew straight off the board without needing any nose weight or trim tabs and with the help of a little rudder offset circles left quite happily.
The main plan is on an A3 sheet with an additional A4 sheet.