This late game mall is based on the concept of sushi belts or mixed item belts. For maximum efficiency research Logistics Station integrated logistics Lv3 which gives you 7200 items/min on every sushi belt.
This mall is based on five sushi belts carrying every item needed to produce every building. Every belt carries 6 different items except the last one that carries 8. The top-most row of planetary logistics stations requests needed items from the network. Behind them is space to produce items that are not available in the network. It's demonstrated with gears, electric motors, annihilation constraint spheres and thrusters. The second row of PLS buffer items that are recycled from the sushi belts. The PLSes are organized in 4 groups of 4 each for the 6 item belts and one group of 6 for a 9 item belt which currently carries 8 different items. Every assembling machine pulls items from all five belts and cross-feeds the next assembling machine. That way, any building can be built anywhere. The output is stored in buffer boxes. Set the automation limit to your needs. Every building produced is then fed to an ILS that has its storage capacity set to the lowest possible value (100). That way, you can request buildings anywhere in the entire system 100 at a time. Adjust as needed. The second row of ILSes request buildings back, so you can simply send buildings back to your mall. Recycled buildings are sent to the supply ILS with priority. All ILSes are supplied with warpers, all items in the sushi belts are sprayed with proliferator Mk. III. on the top right and bottom left corners are storage boxes that are used to recycle items and buildings from your inventory.
This mall is built to be as flexible as possible. Add or remove assemblers as needed, add additional items to the belts when new buildings are added to the game, add or remove ILS pairs.