Id make if from 6061, machine the solid sections, use 6061 extrusions. A mandrel bender will bend extrusions with the correct formers, nicely. All will need to be T0, especially if you want to bend it. 6061 will heat treat nicely if it starts off as T0.
A freind of mine made a 6061 swingarm, he used a steel fixture to hold its form while in the heat treatment kiln.
A quick and dirty way to turn T6 to T0 is 'paint' the part in acetylene black smoke then gently heat until the black burns off, let to cool slowly in air.
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