Ok, Now I think it's time to burst your bubble a bit. Sorry but as fun & great as this little plane is, I think you will find it very difficult to find the room in this little fuse for a smoke system. If IMAC is your intent you might really want to think about a bigger plane. I really don't see many bipes doing IMAC though. Mostly Extras, Yaks & Giles. WM also puts out some pretty nice Extras that might be better suited for trying your hand at IMAC. The WM Ultimate 40 is really just a little wring it out fun plane IMO. I mean they will let you do it, but your gonna be the only little plane in a field of 28%ers or better for the most part. At least that is what the field was at the only IMAC competition that I have attended, with one 90 size brushless electric plane & it looked tiny compared to the rest of them. Good luck with what ever you decide.