I am using a RCS 140 on my 4*120& cut off both cheeks, will make wood cowl after flying a bit. Installed the servos up side down in rear of fuse with hatch for acess. Also have a hatch in side of fuse for battery and receiver, and one more hatch under the front of the fuse for motor batt & ignition. A neat mod to the canopy I have seen is to install backward and cut down to get rid of the big bulge, and look more modern. I also built wing flat and sheeted across where joined for more strength. Mine came out at 11 1/4 pound dry weight with all batteries installed. Oh I did add 1" to the rudder because it looks good.