Göteborg was founded in 1620 (source), before that the swedish west coast port was Älvsborg, at almost exactly the same place as Göteborg, and just as important for sweden (historical note: Älvsborg was taken by denmark in the 1560s, but bought back for 150.000 riksdaler), so Goteborg should be renamed to Alvsborg in the early campaign.
The first system for transporting ships through Stockholm (dictionary says the english word is "lock") was built in 1642(source). The water passes through Stockholm through Strömmen, a shallow rapid which only small boats with little keel can pass.
Södertälje kanal was built in the reign of Karl XI (17th century) (source), but was secondary to the passage through Stockholm (says Nordisk Familjebok, an encyclopedia).
So there was no passage for warships between Mälaren and the Baltic Sea in most of the period of this mod.
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