Centurion Devastator Squad

I wanted  to test out the centurions  but not to buy the models yet. So I took three terminators  and convert them up.
Well how make  grav cannons  without having  to make up a whole new weapon system  with part that I have.
So I sat with the bitzbox  for twenty minutes and came up with a brilliant idea!
I have a lot of assault cannons laying  around  so I toyed  around with the idea and this is what I came up with!
You like this? Hate it? Or just think I'm a cheap basted? 

Have a great day guys!
/Fillee40k