Give the captain meltabombs, as they are cool.
Not the best
HQ. If taking them I would bring a command squad on bikes, it gives a reason for the captain and it is one of the only squads I would trust in
cc.
FNP with toughness 5
Dread with assault cannon and heavy flamer is good, just a little short ranged.
I would personally give the other dread 2Tlautocannon, it gives it a clearer role in life.
Termies could do with a chainfist and
CML. These are maybe not the best unit anyway. The assault cannon is also a good gun.
Powerfist isn't good as you will lose challenges before hitting things.
Going pure razorbacks would be better, it would help your list work together.
Reasonable mech list, the major flaw is you will slightly struggle to hit flyers. Very reasonable though