General Fabrication Procedure
The turbine fabrication procedure starts with a 1.5” shaft. Sourcing: part # 8920K312 at McMaster Carr. Cost: $15
The turbine fabrication is almost wholly symmetrical for the two sides, except for the provisions for exhaust. The side with the exhaust has two features that the other side does not have: a main working gas seal and the exhaust manifold. Look at the picture of the exhaust end:
Both sides have bearings, spacers, seals, and clamping collar. Find a bearing to fit the shaft and slide it on the shaft. Sourcing: part 60355K84 at  for $38 or  for $9, or Ebay for $20 each. Also, find a spacer, with 1.5 inch ID and 1/8” wall. It is 1/4” long + width of seal (see seal design drawing). Sourcing: ______ Cost: Also, find a seal to match the spacer. 1.75” ID and 3” OD.
The disks may now be inserted onto the shaft. Locking collars and spacers must be accommodated, as well as seals.
Picture of disks, cut out by laser cutter:
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