The ManPack looks interesting as I carry lots of stuff when I'm on the road, and often even in town.
I also understand how an LTE Chromebook could replace a phone. We'd all be better off time wise to spend more time accomplishing and less chattering, whether voice, Text, email, and especially "social," like Twitter, FB, and, yes, G Plus. That's one reason I turned off most notifications on my phone, and limit my own "social" to GPlus, which itself can be a black hole of time.
Still, when I'm at the store, it's nice to be able to phone home and ask if we need milk . . .
I used my Sam Arm (v1) with Google Voice to make calls on WiFi. Worked. And certainly picking up voice mails on the computer is great. But I'd presume the 3g speed on mine would be stressed by voice. Thus LTE.
And there carrier matters. I use and really appreciate T-Mobile on my phone, but 25 miles from home I have only voice, no data. The Verizon 3g on the Sam has much better coverage, it's just far slower than my LTE Nexus 5. Wrap up: if you always are in LTE range AND can get by with all your calls you can't answer when the lid is down going to Google Voice, the solution you have adopted could work well.
Onrushing train: Google is going to make big changes in Google Voice, and they may disable how you're using your CB as a "phone."
Skype is apparently still not an option on CB. May be others that are, and there's a hope Google's changes could improve instead of kill GV.
By the way, my Androids are trouble free, reliable, and can do anything my CB can. Just a matter of an external keyboard.