Most kits do always have the plans and all the balsa needed to complete the plane, however alot of the other things that are needed are not always in the kit. Some of the kits have motor mounts, some don't, and so it goes for all the needed accessories. Great Planes kits seem to have most of what you need however you still need to pick up other items like wheels, axles and such. You will need to purchase all the covering and glue for all kit's as well. Hope this helps, Dave