This is a completely open build as well. You can download the full bill of materials, buy the parts wherever you feel is cheapest and assemble it at home. You may need to use a local makerspace to print a few of the parts but if that doesnt work for you there is this video on building a 3d printer without plastic parts. This video uses the similar build type and replaces the plastic parts with temporary wood structures. I personally would opt for the local maker-space since they are worldwide to get the few parts printed.
Overall if you're looking to get into 3D printing this series of videos can give you the knowledge you need to get into the hobby.