This is a 48hp build for my 4ms pod, featuring a faithful clone of the TB-303 sequencer by Michigan Synth Works. This is a cool build because it brings the 303 workflow into the eurorack format, allowing a mix-and-match with various synth voices and filters. I added a Pam's in here because it's a versatile clock and modulation source, which will work well in this very focused rack.
I chose the Basimilus Iteritas Alia because it can hot-swap firmware between the other Alia platform modules, which means this voice can be changed to the Manis, Cursus, Ataraxic, Debel by swapping the firmware. The Roucha Legio filter also has similar hotswap capability with other Legio platform modules.
This rack is small, focused, and extremely versatile.