Get the GP Super Skybolt. I've just finished building one. I started the project November last year. I am planning to fly it sometimes next year or as soon as I finish breaking in the OS 91FS II w/pump for it. The shape and detail on the GP's cowl look much better the Sig's. The cowl also fits better, too. I assembled the entire fuselage using wood glue from Home Depot and assembled the wings using CA glue. The reason for the wood glue is that it allows you time to do minor readjustments after you rubber-band the parts into place. You need lots of rubber bands to conform the fuselage into shape while the glue dries. Use a really wet spone to soak the fuselage sides before bending them to the formers. Even with the heavy OS, I still need to move the servo tray way forward. It tends to be tail heavy! I can't get it to balance correctly even with the EMS on-board glow driver and batteries way up front, I ended up destroying the original servo tray to move the servo forward. I didn't like the original servo tray anyway. I made new one and arranged the servo in V-shape to accomodate pull-pull ruder and still have the elevator push-rod perfectly center. I used 40-lbs fishing line for the rudder controls. Don't use the given fixed tail gear. Get a Sullivan removable tail gear. Be sure to build a strong plywood plate to support the tail gear (just cut away part of the original belly cover at the tail). Use blindnuts to mount it. Also, don't build the main gear to the fuselage as suggested. Make the cut-away part removable. I mounted the cut-away part using blindnuts and screws. I drilled 2 holes on the gear and expoxied the blindnuts behind it. They go in at an angle to avoid hitting the mounting plate. The whole thing balances perfectly without extra weight with a 4-strokes and glow driver. The wings are easy to build, just need to do it twice. It looks better and flies better with airelons on both wings. Mine is 10.65 lbs dry.