Here my workshop setup :
The changes allowing us to repair an entire set of machines by hitting just one of them was a god-send. We decorated our machines with ornated glass panes, decorative gleam, etc. No need to have an actual access to the room below.
Below the ground, we made a room with 2 blocks of space to walk in, with additional trenches to go under the spark-links.
It’s super tight, but we managed to have the same spark-link network for the machines below and above. Two to three more spark-links and we’d be at the limit for this network. ^^
We used foliage and starberries as a fig-leaf to hide the upper coils.
In case you’re wondering, here are the colors we used for each machine.
Refinery : Bright sepia gleam - Stark orange glass panes
Centraforge : Pale lylac gleam - Light lylac glass panes
Mixer : Vivid moss gleam - Stale moss glass panes
Compactor : Warm red gleam - Light red glass panes
Extractor : Light azure gleam - Bright blue glass panes
Workbench : White gleam / glass panes