too bad you didn't get a shot after you fixed the gap, soon as I saw I started thinking of ways to fix it so I would have liked to see your solution. and in regard to the hatch was your mod something to do with sinking the doors into the wall? (same reason)
Overall not a bad practice run I would suggest trying again some time, perhaps with more deviation from the inspiring design. I think Brentlymills Big Red Courier
is the best example of what an inspired design should be: clearly similar elements and motifs, but at the same time unique and clearly different in the details.