That's correct, just forget about having walls/channels.
The reason I mention it, is because these walls actually act as fins, and as such, would help spread the heat upwards from the baseplate.
But because this wall/channel is so far away from the core, its effectiveness would be next to null, as a fin, so it would only help direct flow.
In this case, you probably don't want to direct the flow, or more specifically, restrict the flow, even if it's just a little bit.
It would also make the construction more complex, and IMO (in my opinion), it's just not worth the effort.
Refer to Volenti's pin fin block: he's getting excellent results. Even Hoot (form OC) is getting excellent results.
You're headed in the right direction. I'm just proposing that you keep it simple. It's really up to you.
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