[quote=@Ascendant]
Even biological organisms would use metals, Iron is part of our blood for instance. Beings that use all biological tech would likely incorporate larger amounts of metal into their designs to create hardier organisms as an example.
[/quote]

Not really. Insects rarely utilize metals and they create unfathomable feats of structural engineering. And anyway, this isn't exactly the most scientifically sound RP. And anyway. Really, their vessels take just as long to make as metal ships. Because, naturally, they have to be grown from scratch.