Parts for the Sig will mostly be sheets of balsa and plywood and your trusty hobby knife. Some covering will usually be involved too. Each mistake you make will be followed by a few hours repairing during which time your building skills will improve enough to get you ready to build or put together the next plane you want to fly. The Sig is the best choice if you want to move on to aerobatic planes and take the hobby seriously. The various foamies are easy to fix and a better choice if you want to go fly once every month or two when the weather is nice.