Another good covering is the lightest weight Ceconite you get from Aircraft Spruce and specialty. This is probably the least expensive way but very labor intensive. You do need to use an adhesive (also available from them) and then finish with dope. As far as fabric coverings go, I find Solartex (also Colortex or Worldtex) to be easier to use than Coverite as it adheres better to itself at seams and goes around compound curves much better.