Order all components in the BOM. Generally, these do not need to come from the named suppliers.

Fabricate the few plastic components by 3D printing. Note these some are intentionally plastic for dampening, and should not be replaced with metal equivalents.

Explore the CAD model with SolidWorks or eDrawings (free of cost). Assemble sub-assemblies first (outer frame, linear thrusters, Z-axis couplings, etc).

Fabricate brackets for any tools desired. Anything compatible with an Arduino/RAMPS board is possible, including traditional FDM extruders, inkjet heads, lasers, milling spindles, probes, etc. Add a Raspberry Pi to drive even more complex tools, such as a microscope-projected DLP head.

Make something!