Plan of attack

A few things should be outlined in order to maintain steady progress and not get bogged down in details when conducting this project.

First things first, a rough idea of phases should be set down to list deliverables.

1. Scope definition - produce a small brief to keep a clear picture of exactly what we're trying to achieve with this project. Produce a tentative timeline to keep us on track.
2. Research - a big one, here. We need to produce as many detailed notes on how a machine works, how espresso should taste (so we know if our machine is any good!), what parts do well in what situations, what is suitable for our needs, how much should we budget for, how electronics will function, document other peoples own DIY efforts and lessons learnt, and the list goes on. This will be a major chunk of the first few months, so we are as prepared as possible going in to the following phases.
3. Design - a compendium of sketches, 3D models, inspiration sources and similar - culminating in a few shortlisted designs. The best one shall go on to be built.
4. Material procurement - produce a BoM (Bill of Materials) so we can source them from the cheapest suppliers. Get in touch will suppliers and/or experts for recommendations on components. Produce a budget to prevent unneeded spending.
5. Fabrication - decide what will be put together ourselves, and what will have to outsourced. Assemble the machine.
6. Commissioning - test the machine for flaws in construction, test espresso quality, assess functioning of all components, tweak and/or repair necessary components.

Then we shall enjoy the fruits of our labour with as much espresso as our hearts desire!