White Scars List Idea

As I was falling asleep last night, I had this idea of a White Scars plasma gunner army. 

Imagine these in white...

It makes sense in my head to have 3 big blocks of hellblasters, surrounding a chapter master, chaplain, Lieutenant and chief apothecary. They all advance forward in a castle, getting buffs from the character bubble and ignoring advancing penalties.

With assault plasma incinerators, that's 30 shots at 24" S7 -4AP D2. That's a lot of dakka and I'm not sure what can stand up to that, but even with Transhuman Physiology, I don't know if they can survive. 

Maybe if they were in Impulsors? 

On paper is makes sense in my head, but I'm not exactly sure it's practical. So, here's my Amazon wishlist if someone wants to buy it for me...

Amazon for the Khan!