The mall uses sushi belts to supply a ring of 60 assemblers. It has the following features:
Tiny footprint, low energy consumption, relatively low UPS.
Completely robust. Gracefully recovers from power failure and lack of input materials.
Flexible. All assemblers have direct access to all materials. There is space to add more buildings.
Makes its own warpers.
Can be built on yellow tech, after crafting some PLS, ILS and pilers.
Can exchange items with Icarus. Will also export items globally. Buffers items so they can be requested in small quantities.
Makes logistics vessels, drones and bots. Makes its own warpers and accumulators, but does not export them. Does not make foundation or proliferator.
Mk2 assemblers are used for convenience before Mk3 assemblers are available, and to reduce the risk of draining the belts too quickly. You can update any assemblers to Mk3 as you like; I would recommend only doing that for high throughput items like belts.
All buffers are set to minimal sizes to reduce the startup time. Expand buffers as required.