I would have loved to see these things with a reactionless engine rather than that single rocket thruster underneath because I keep thinking "How the heck does it keep running for 200 years without having to restock fuel" and "If this is a nuclear engine then how much heat is being pumped into the home" and "I wonder how many young kids crawling on the floor got burned".
Stupid I know, as it's a sci-fi game but OMG does it seem to be dangerous. If you have played Kerbal Space Program you know how long a rocket lasts with a small amount of fuel that would be contrained in the Mr Handy/Gutsy... as in sneeze and you have run out of lifting thrust hehe.
Now if they had used a reactionless lifting engine that they stole from the aliens it would have made much more sense.