Greetings!
I quite agree with all of this. I think I've read all the various Edda versions as well as a lot of other Scandinavian mythological texts, but I've always found anything on Vanaheim and the Vanir to be rather vague. That was the main reason I asked. I was wondering if you had found information that has eluded me and the other two members of our project group.
In our Jorðgarð campaign setting, we've been taking Eddaic ingredients and trying to weave them into a credible and playable RPG environment. In Snorri's Prose Edda we see how the folk we came to call the Æsir moved from Ása (Thrace in Asia Minor) northward through Europe. As they moved, their leading deity Óðinn (Odin) began as a secondary figure, with Tiwaz (later Týr) being the top deity, and as they moved Óðinn gradually gained that role and the position of Tiwaz/Týr receded. As Óðinn led his folk northward, his name changed 170 times, according to some studies, with the main versions being Woden, Wodan, Wotan, Ódin and Óðinn. We started our campaign setting in the Fallen Empire in Ása, the lands that Óðinn and his followers abandoned. The next segment then will move to Ásgarð and Miðgarð, where Óðinn et all still will be very much present.In developing the backstory/history of my version of Vanaheim, I've tried to stick to references from the Eddas, with mythological accounts actually being re-tellings (or in some cases, mis-tellings) of actual historical ones. <SNIP> I'm developing Vanaheim (and the other realms, for that matter) as existing in a sort of pocket/alternate dimension occupying the same space as Earth (Midgard), but each with very different geographies, climates, etc.
However, I hasten to add that our work is by no means mythologically accurate. Rather, it is an RPG adaptation. Good luck with your project!
Servus,