Wookiees are well known for their scientific knowledge, including astrogation. That's part of the reason they were chosen for the Death Star project over say... Gamorreans. Not only are they strong and tough, they are quite knowledgeable as well. Between Han and Chewie I'd say Chewie is probably the brains of the operation. They're tech might sometimes look primitive due to it's incorporation of wroshyr wood, but with such a resource why not use it?
In terms of sources of vehicles on nearby planets there is Ubrikkia (a source of vehicles for the Imperial Army and the Hutts alike) and Lantilles (Known for making very reliable ships over flashy or elegant ones. They are also known for allowing aliens into their guilds and companies, which I imagine would include Wookiees). The Wookiee colony world Rakhuun has a small shipyard where beautifully designed yachts and freighters are produced.
Edited by Lord Zack, 16 February 2014 - 05:30 PM.