I got a Guilliman model, but I play DW, so I want to kitbash it with a Deathwatch flair. However, I'm not sure how to do it. I have doubts of the left pauldron being too big to just replace it with a DW termi pauldron, and I want to replace the sword with some sort of necron weapon (I don't know if a printed xenophase blade would look good). Any suggestions for this?