Quote Originally Posted by paul3373
I've downloaded a few tech tree's for MTW and still don't understand why I can't build certain things.

I'm playing as the Danes.

I have a castle and a dockyard, why can't I build Caravels?

I have only been able to build a metalsmith in one province. I'm guessing, but does this require metal in the tradable resources?

I have a keep (and castle) and boyer's workshop, why can't I build crossbowers?
Which period are you playing? Not all units are available in all periods...

Metalsmith requires iron and that is only in a few provinces: Sweden, Hungary, Bohemia, Aragon, etc.

Download a unit guide and units related xls files they come handy if you want to know how to build certain units...