Yeah maybe on the washer next time! i know that I made several mistakes that I will avoid on future paper builds.Chief among them is adequete support structure for the outer wing sections.The wavy pattern is the result of this oversight and the fuselage cross section neeeds more bulkheads.. Still it is a valuable learning tool even if the end result is a poor model.Perhaps the instructions being in Polish is an issue too.I do find this build to be fascinating one even if I have a comptomised model.At least I will know what not to do!