Is the first generation 970 Panamera an "easy" car to work on?
 

As the title says: I'm looking for a replacement for my Ford Focus as it is a real POS and as I already have a Boxster in the garage I'm looking in the direction of Porsche products.

I do 99% of my own maintenance on both the Boxster and the Focus and it is important to me that whatever car replaces the Focus is something that I can, at least in theory, work on myself.

I would probably go for a bargain basement base model trim with the V6, thought I think I would prefer the Panamera 4 over the 2 if I can find it.

Does anyone have experience working on these cars? Any perspective on what they are like to maintain in your own garage?

No direct experience, but similar. I, too, do a lot of work on my Boxster, and we purchased a Cayenne as the wife wanted an SUV again.
i've done suspension, replaced the hydraulic pump (pretty involved job) and basic oil service and coils and plugs. I think your skills will transfer well.