You know I think alot boils down to what the baby's like - that's the great unknown. Because you're not just talking about going back to work, you're talking about trying to work from home while taking care of the baby at the same time which is a whole different thing

I could've run a multinational corporation from home when my first was a newborn - she was totally undemanding, self settled from birth, slept 95% of the time...she was a breeze. I was going to go back to work when she was 6wks old because i was bored LOL. So a baby like that you could definitely work around.
DS was very different - while not superdemanding he did like to be held alot and needed help to settle to sleep, and fed alot more often than DD etc - that takes up ALOT of your time in the early weeks/months.

I guess I'd say plan for it, but try to keep things as flexible as you can in case you get a high needs baby and find you can't put them down or do anything for a couple of months....I think what you've outlined above is a realistic plan though!