Being a dedicated Deathwatch player, and having to be creative with the limited unit choices we have to bring to bare, my fellow Xenos hunters have been aware of the Venerable Chaplain Dreadnought for some time.
With the recent change in the meta to be Space Marine Heavy, it seems that the world-at-large has discovered the Venerable Chaplain Dred... and now they are very difficult to find, and I think Forgeworld might have even discontinued them! Soooo... what is one to do?! Well, here is a suitable conversion that is equitable in size, and (in this hobbyist's opinion) might just fit the bill!
Here is a side-by-side comparison of my conversion on the left, Deathwatch Chaplain Venerable Dreadnought, Gormann the Elder of the Crimson Fists; and the actual Venerable Chaplain Dreadnought borrowed from a friend!
Now, lets get into the actual build! You will need: 1) the Blood Angel Death Company Dreadnought Sarcophagus, and 2) the Blood Angel Furioso Sarcophagus!
Next, you will need to separate the center part of the Death Company Sarcophagus from the side panels, and do the same for the Furioso Sarcophagus! Be careful not to trim too far into the structure of the pieces you will need to glue together!
If you haven't already built the main body of the Sarcophagus, you will want to do that next. Now glue one of the "winged" panels of the Librarian Sarcophagus to the body.
Next, glue the other "winged" panel of the Furioso Dreadnought to the body.
Now, you will want to put in the Death Company Sarcophagus center piece, making sure it fits before gluing it down. You can always do a little trimming if need be to get a snug fit!
You may need to put in some green-stuff to take-care of any "major" mistakes. Now, using your modeling glue to secure the center piece down, put some glue in between the panels and centerpiece to chemically "weld" it together the pieces together! Voila!!
Now, I can put either two close combat weapons on with dual Storm Bolters...
Or, I can put a heavy weapon... like a Lascannon!!!
Now we have a very convincing conversion, using all Games Workshop parts, for a solid Chaplain Venerable Dreadnought Conversion for competitive play! Now go out there and get some "For the Emperor!!!"