Tissue or silkspan for sure. Tissue is OK for small airplanes that won't get much handling. Silkspan is a bit tougher (comes in different weights - you probably want light weight for easier covering of compound curves).... Your call... Application to the airframe is the same for both.

Silkspan and dope (model airplane type - not the smoking type ) is available at the LHS. Comes in two types - nitrate and butyrate. I use butyrate to keep things simple, others use nitrate - sorta like "Chevy vs Ford", "high wing/low wing" arguments. Can't mix them and as I recall, you can't put nitrate over butyrate - will dissolve the butyrate. Comes in clear and colors, so yellow is an option. Be sure to get the correct thinner for the dope you are using. Since you're not gonna fly the airplane, you can go for a factory type finish with as many coats as you want.

Another covering option is to cut the tissue slightly larger than the part to be covered, spray it with water (damp, not dripping wet), place it on a towel and brush full strength clear dope to the outer edges of the structure to be covered, apply the tissue, and apply a second layer of dope over the edges of the structure thru the tissue. The tissue shrinks as it dries, leaving a nice tight surface. For difficult areas, you can cover just a portion at a time. I prefer this method because the damp tissue conforms to curves more easily than dry... Both will work...

After covering is complete, thin the yellow dope about 50% with thinner, and spray (if you have an airbrush) or brush it on... Thinning the dope when applying it requires more coats, but gives a smoother finish... Besides, you get to smell more thinner and "go where no man has gone before"... Use ventilation!!

HTH

Jim