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My 2c anyway.
Overall a very nice list, just some comments -
Great..pretty much a build that most people take, MB's are fine as a points filler.
Fine if it works..I don't like it because the Vendettas more often than not are lost when used as early - game transports...totally your call though (obviously). I'm not a fan of Doctrines either..90 pts that is better spent elsewhere.
Great choice, and the HB's are a wise move for the reasons you stated.
You can't swap between the BB's and normal weapon profile, so you will have to use the BB's the entire game.
Great tank and very killy, although just because it has a Lascannon doesn't make it a good tank hunter.
This is quite possibly the worst unit in the Codex aside from the Punisher..far too expensive and ineffective to be a reliable tank hunter, and the more you field it the more it will disappoint. Pask just makes it more of a points-sink. Your Medusa is a class above this even when its short range is factored in, and you also have your MeltaVets, plus for far less points you could take a Manticore which is an excellent long range anti-tank vehicle with the additional benefit of been a great anti-hoard/MC killer.
My 2c anyway.