Yes, that's correct.
I simply cut off the side parts of a HH (where normally the secondary weapons are located), and used the stock (hope that's the right word) of a 40K Pulse Carbine to hake the turret higher so the two railguns could be glued on.
Then I made two missile pods from the front of several 40K Pulse Crabines/Rifles, glueing them between hull and engines, and cut off and glued a burst cannon to the tank front:
The only part I needed from the second HH was the railgun, so I simply cut off the turret hatch and glued it straight to the place where the turret normally goes, the cut off the pulse carbines from two drones and glued them where the smart missiles normally go - finished Devilfish.
It is quite often that a HH or Skyray ends up as a Devilfish because I need the main turret weapon...
You could of course also go the easier way and leave the TL missile pods in the usual secondary weapon place in the side wings, and also use the normal turret config, just with twoi railguns
