Thunderhawk help

[Adeptus]

Hi folks.

 

I was looking at my Thawk today (thinking that I really need to pull the finger out and start painting the bastard) when I noticed that one of the underslung Heavy Bolter turrets from the wings is missing. It must have fallen out somewhere when I was transporting it to or from a game, and it's nowhere to be found. I've since decided to replace it (and the other turrets) with psycannon ones from Forgeworld. Does anyone know if the razorback turret is compatible? Is the socket the same size? And does anyone have the FW psycannon turrets? Would you be able to assemble them 'upside down' so that you could mount them on the wings of a thawk? And would they be suitable to mount on the 'nose' turrets?

 

Any help much appreciated!