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A slightly different all reservre list (apart from the 1st turn burrowing mawlocs). Light on anti tank but I think it should be ok as long as there are not too many boxes.....
HQ Mother of the Devouring Light Tervigon Stinger Salvos Catalyst Adrenal Glands Toxic Sacks Scything Talons 200 Elite Companions to the Mother 5 Yg Stealers 115 Herald of the Darkest Light Doom In a Pod 130 Troops Minions of the Northern Tundra 8 Stealers Toxic Sacks 136 Minions of the Southern Desert 8 Stealers Toxic Sacks 136 Minions of the Eastern Plains 8 Stealers Toxic Sacks 136 Minions of the Western Savanah 8 Stealers Toxic Sacks 136 Heavy Sleeper of the Mountain of Ust Mawloc 170 Sleeper of the Pit of Knai Mawloc 170 Sleeper of the Rent of Mbal Mawloc 170 1499
Mmmm... I'm worried about your anti-tank. Apart from that, it's an interesting concept and a fine list for your situation. Just hope you don't get an opponent who camps all his infantry in vehicles.
P.S. that's the first time I've ever seen Tyranid units named. I don't even think they do that in White Dwarf lists. Good job.