Here is a conversion I did for my COL Straken. It was actually very simple. It utilized the Praetorian Lieutenant, a space marine plasma pistol, and the old Straken model. Here are the original models before any work was done.
Next I cut the arm off of the Lieutenant right at the epaulet. I also removed the bolt pistol which surprisingly left the holster details. I trimmed the hand from the plasma pistol and glued it on. It was a good fit.
Finally, I cut the Straken model's shotgun arm just below the elbow. I actually started above the elbow but found that it was too much. I slowly started removing metal until I found the right fit. Here is a front and back view of the final model.
I think it is a convincing substitute and can't wait to get it painted up.
Next I cut the arm off of the Lieutenant right at the epaulet. I also removed the bolt pistol which surprisingly left the holster details. I trimmed the hand from the plasma pistol and glued it on. It was a good fit.
Finally, I cut the Straken model's shotgun arm just below the elbow. I actually started above the elbow but found that it was too much. I slowly started removing metal until I found the right fit. Here is a front and back view of the final model.
I think it is a convincing substitute and can't wait to get it painted up.