All kits are Foam-only, and include all the foam parts required to build the plane, but do not include other materials such as spars, ply motor mounts, control horns, etc.
Readiboard kits are 3/16" thick and covered with white kraft paper on both sides. The parts are cut with both sheets of paper in place. The cut is completely through the top sheet and the foam, just touching the bottom sheet. The parts all stay with the sheet, but are cut completly separate (no skips in the cuts). Shipped kits are cut apart in groups. The paper generally peels off without any extra treatment, but if it's stubborn, getting it wet then letting it dry will kill the adhesion and make removal easy. Paper should always be removed before constructing the plane.
Model Plane Foam kits are 1/4" thick and are foam only (no paper covering) The parts are cut about 90% through the foam and can easily be separated "snapped apart". A light sanding of the edge will remove any slight "flash". These are ready to assemble as soon as separated.
Your Humble Host:
So where did this one sheeter idea come from anyway? Believe it or not, it was a contest/challenge on RCGroups.com. I had been out of model aviation for 30 years or so, but had just retired from GM and got the itch to build a plane and get back into RC. Bought a radio and a Gentle Lady kit and got started. Got her completed in a month plus, tried flying her and after a series of crashes and very tedious repairs, was almost ready to give up when I stumbled across RCGroups. In browsing the site, I came across the Scratchbuilt foamies forum, learned about the use of fanfold foam and dollarstore foam for building materials, and got started on an adventure that has allowed me to build more than 50 planes from simple trainers to fairly complex semi scale birds. Several years ago a fellow foamie scratchbuilder posted a challenge to make a plane from a single sheet of Dollar store foam. His original challenge was multi part, with sections for speed, lift capabilities, etc. As it turned out I was the only person to follow through with a plane; what became the OneSheet Glider. Initial design thinking started on a trip back to Michigan from Texas and the design finally used all of a DSfoam board but a few tiny pieces. After the success of that design and build, i was hooked on the idea of building different planes using as much of a single sheet as possible. The next challenge was to do a design for each letter of the alphabet. We'll see if I get all 26!