RE: fusion?
It's amazing how light the fusion ARFs are coming in at. Most at easily sub 7 lbs which is unheard of for a 90 size plane. The OS 91 is plenty of power so be careful with the OS 120 so you son't overspeed the plane. JoeBob is right in that I think the Fusion can fly at a wide range of weights easily up to 8 lbs and maybe more. The first production kit built plane we did which John Drake is now flying weighs close to 7.75 lbs. This is the very plane shown in the Andrew Jesky video and flies frickin awesome. My kit built weight 7 1/4 lbs and does fly lighter obviously but for pure pattern the heavier one naturally tracks through manuevers better.
P.S. We now have fiberglass wheel pants at a very reasonable price for use on the Fusions..or any other plane you want. These are very light and come in yellow or white. They will only be about 10-12 bucks a set and should be on the webpage shortly.