I bet this thing could fly better on a lot less power than shown here. Not for any other reason than it would allow lighter weights, and it's not like you will miss the vertical in a 900 foot loop with smoke, right?? The approach speed is a bit too fast to look right, and a lighter weight setup would help there. Unlike an A-10 or other types with a fat trainer type wing these type of jets have razor thin airfoils - so to slow down and fly scale like on approach, even with complex slotted flaps etc... it has to be lighter. I'm not sure of the prototype's weight to begin with, maybe you need all that power due to the type of construction but I think these types of jets can easily fly on .6:1 thrust to weight based on my experience with these types of designs - almost half the drag of a fighter straight and level and a third of the drag in a turn (depending on comparison of course)

I really like the size. To do the G550 justice with turbine it has to be bigger like it is.

Looks like it's a really nice setup in the making. Agreed with the other comments on the cockpit - it needs a tweak here and there for window arrangements, certainly. Nice job guys.