Checked the aileron throws tonight and they are 1/4" low and 3/4" high.Really touchy on high and may bring them down a little.The reply on the inserts was on the money,I used the DUBRO.I glued another piece of balsa behind the screw holes then drilled them out to the proper size and put a little epoxy in the holes then screwed in the inserts.Used 5 min epoxy and worked the cap screws in and out to be sure the threads stayed clear.Not able to get a good picture of it as my digital camera is acting up,menu screen is not working and cant change settings for close up shot.I will keep trying.As for the 120 engine I think it would fit but I believe the 91FX that I have on mine is more than enough.I found a program called Thrust HP in one of the modeling magazines and downloaded it for the site.I entered the rpm,prop size,and type and it shows 12.71 lbs static thrust with apc 14/6 prop at 10500 rpm.On the 4 flights I have on mine saw no problem with vertical but to be honest I am waiting for the engine to have a few more flights on it before I go to crazy with it so as not to cook the engine.As one of the guys at the field says"no point in cooking it if you cant eat it"......The plane balanced perfectly as is with no lead anywhere,might need some with the larger engine.Picture shows wood prop but it will be changed out for the apc,used the wood because I wanted it to break and not damage anything else if i goofed up on the first few landings.