- Closed top wingskin using part back riveting and standard riveting procedure
- Checked rivet deformation with gauge as work proceeded
- Checked for "oil canning" tendency. None found but could occur with little pressure aplied to the skin.Decided to install skin stiffeners, as commonly used for full size gliders, such as IS28 or Blanik.
- Prepared channels and fitted for length, installed in sections between main and aux tanks
