I think I have it down now. Thank you. My drydock was designed with administration, civilian support and military support all located in the top modular pods. The pods all have solar collectors on top of them and interlocking nipples between them allowing wide and open passage between pods. Each pod has 2 decks or is open on the second deck level to the first deck as more of a balcony or mall affect. The lattice work is designed to support the weight of the modular, repair pods, assistance armatures (not shown here) and lighting systems. The size and mass of these items would require sufficient engineering support especially when the dock is being maneuvered. The barrel pods are service pods designed to stage all the parts deliveries, assistance drones and transports, EVA staging activity and administration at the actual assembly level.