Finally bit the bullet and started. Drew up curvy bits such as wing, stabilizer and rudder ribs on CAD. Printed them out 1:1 scale and traced them on to the 6061-T6. Only done the 0.016" bits so far (oh and the 0.025" spar webs), but it was good to finally get some aluminium out and start work.
Question now is what the best tool is for long cuts. 300mm shears? Nibbler? I know for damn sure I won't be making 12 foot cuts with aviation snips!