The frame as shown with just the motors and plastic housing weighs 780 grams / 27.4 ounces. Maybe it's getting a bit on the heavy side with 24.5 mm aluminium frames but the aim for this one is primarily rugged and simple. If it does turn out to heavy and flight time is severely restricted, aluminium tubes half the size would do the job. Why not use them in the first place? Aesthetics was part of it as the fully enclosed 24mm frames might let me hide some wires and speed controllers to make it look more tidy.
The motors are 520mm apart which is probably the minimum separation for motors / equipment of this size – see the tips here on setting up and general rules of thumb for quads.
2 x CONNECT-IT Aluminium 600mm lengths: $5.81 each.
1 x 6 way joiner $2.24.
4 x End Caps: $0.49.
1 x Food container with clip on lid $3.36.
4 x Turnigy Plush 30 Amp Speed Controller: $11.54 each