I built a friends(funfly2005)with a Saito 100,used a 650 nimh and reciever under the canopy,and the servos in the tail,hs625's on elevators,hs645 on rudder,APC 15x4W and no spinner.We didn't check the cg,but it flies great,probablly a little tail heavy,but very flyable.I wouldn't want it any other way,the Saito 100 is definitely the right engine,and it does everything great.The plane is an absoult blast to fly!!Flip and spins are awesome,never seen a waterfall so axial.Final weight is 6.2