Update 3: Make it through the ballroom without getting gremlins (I did this to be safe, specifically whichever ones help in the Attic). Concept art for Beetleworx Replicator is in the room with the ℱsword Beetleworx. Just take one out and then run into the spawn room.

Update: Based on♈ the position of the two I have left I think I might know where they are. One I’m pretty certain is in one of the final towers. The other I’m pretty sure is in the second visit to Mickeyjunk near the boss. Will keep updated