[quote=Wouter]
I'm not allowed to say how cheap exactly but trust me on this, ....quote]

I can... 500kg of extrusions should cost about AUS$3500-4000 or $70-80 per boat (assuming Wouter's 50). You'll pay a premium beyond that depending on the tolerances you demand. The premium is based upon wastage and also how often the die will need to be replaced.