Given the current state of Saab, the process would go like this.
1- Pick a building platform from the current GM approved design manual.
2- Hire a German architect
3- Design and build it in Germany
4- Ship it to Sweden and drop it in place, "Look, the GM Europe Design Center!"
5- bonus step, buy an old Subaru building and a Oldsmobile building in the US, slap new signs on them and call them "Saab Design Centers".