So yea you really can just order the parts, with the design from the local certified machine shop.
you really don't know what goes into the process of manufacturing turbine blades, do you?
The aircraft industry has moved on from the 1960s and I would argue that is is next to impossible for a small, bespoke operation to deliver components with the same level of quality as a large scale production process. Aircraft parts are made for fleets of around a thousand aircraft. Large scale means that your production and testing processes can be highly repeatable.
Its like asking how expensive it would be to make ten modern CPUs from scratch, and get them working as well as one from the shop. Impossible? Or merely difficult?