I'd ditch the Doomsday Ark and get 1 or 2 Annihilation Barges instead for Heavy Support. The DDA might look good on paper, but it can't move without severely nerfing the gun, so its sort of a sitting duck.
3 Scarabs wont do you much without a Spyder or 2, so I'd just start packing away whatever scarabs you get from your boxes until you can build a "scvrab farm", and at that point think about getting a Spyder or 2.
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