Now there are a lot of different kinds of ceiling tile out there. I used the thick 1/2 inch ceiling tile that you find most commonly hanging in stores and in resturants. It pinned down fine for me, but I had to screw it down to the door to make it flat since it bowed a little. A little note on building the wings. If there is a little twist or if the wing is just not right an 1/8 inch or a little more do not worry about it. It can be trimmed out later in flight. Mine was around 1/2 or a little less off on the dihedral and it flys great. I used a supertigre .75 with a slimline pitts muffler (http://www2.towerhobbies.com/cgi-bin...?&I=LXFG90&P=0) and had to adjust the engine mount a little to allow for the muffler to go straight out the bottom. It sounds sweet. I get a lot of comments on how it sounds better than a four stroke. I had to cut a pretty good bit of the muffler off to get it to fit correctly. I would post pics but I cannot get my friend to get them off his camera.