I believe that saw is based on the 540 chainsaw. Don't bother converting it to a chainsaw. You're better off selling it if you don't want a demo saw, then buying a chainsaw. I have a friend who has one of those. He calls it his "church key". LMK if you decide to part with it...
Here's the 540 Chainsaw listing on Acres' site. You can see the resemblance...
Model Profile: 540
My father has a DM54 since new. He has repaired the muffler several times. Welded the handle bars back together and cleaned up a scored piston. That saw always starts and has cut alot of pipe and rebar. I second the above. It is a good tool to keep or put it up here as a parts or runner as the parts are hard to come by.