The most chalenging but fun part was to build an administratum icon from scratch which ended much better than I feared. Of course, since I didn't want to model more of it, I made an Oyumaru mould and got a few cast with resin. The result is more than pleasant since the original and copy look exactly the same when painted.
This building doesn't provide much in terms of gaming (not much room to climb on but it does offer some good opportunities for scenic shots and the sheer size of it makes it a perfect focus point on the table :
Then the Central processing building, which just fits right with the other buildings :