So, we've known about the Automatron achievements for a while now, thanks to Steam, but with the 1.4 patch on consoles a little more info trickled down, including more detailed artwork for the achievements. http://www.gameinformer.com/b/news/archive/2016/03/11/here-are-the-achievements-for-fallout-4-automatron-dlc.aspx. The artwork for "Restoring Order" shows the Mechanist and the silhouette of an army of Protectrons - all with Mr. Handy floaty bases, instead of Protectron legs. And for "The Most Toys" we see a similar Protectron, and a Mr. Handy with Protectron Legs.
And before Automatron was even announced, we had artwork of Mr. Handy/Protectron hybrids in the game, the blueprints at the Switchboard and a few of the robot models that could spawn in lunchboxes.
So we've talked about customizing robots, but I don't think we've ever talked about mixing different robots together. What do you think?