Thanks Hellcat, well as this moment, Im working on the plane, just sanding it a little bit, and also started cleaning up another engine that I have, which is an old O.S .40 SR, still think that would overkill the model, I have around 40 models, scale and not scale, but currently moving them from one city to other where I live now, and started cleaning up the old planes, the one's that belonged to my dad, and some of them where I learned to fly, so using old engines its quite often for me, I started cleaning up the .40SR because its a little bit lighter than the FS-40, and has the same size crankcase than the .35 oldie, because I want the A/C to be a "fly where it may" I wanted to put a 2-Stroke, so can easily be turned on with a chicken stick, not needing the full setup using an electric starter, because those old FS-40 4-stroke engines tend to bother a little to cold start, just wanted to discuss a little bit, what do you think about it ? oh by the way of course I will use monokote, the lighter the better, and its the best material to use on this case.