I've got an Estes QCC Explorer on the bench right now. This build is scratching my balsa airplane building itch with the built up balsa faux intakes. The faux intakes are a little more complex than your typical 4FNC build, but the laser cutting is very clean, and it all locks in together. So long as you manage to not glue yourself you the parts (too many times), they go together very easily. The assembled intake pods with the fins is a very strong structure. That coupled with the clipped delta fin shape should make for a very robust airframe. I'll attach them with 30 minute epoxy (what I got ... Would use 5 min), and they should survive many rough landings. After assembly, I skim coated then in glazing putty (automotive stuff), and then sanded to shape. Really liking how the glazing putty fills the grain.