
No worries, I haven't built one in awhile either. The platen is made with the laser cutter and mdf. The impression plate can be made with a laser cutter and acrylic or you can order polymer plates from a company that makes them (I know of boxcar press). I guess the max size would be 2.5 is 4 inches for the impression plate; I just made the impression plate and paper business card sized.
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Those are the cap nuts you can get from McMaster. You only need 2 (4 was a typo) to hold the handle assembly together.
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I uploaded the .eps file for Ponoko
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Those are handle spacers made out of acrylic. you could make them from mdf if you want to. They are in the Hand&Ink_Press.AI file under the label 'handle spacers'. As long as the material you use is 1/4 inch thick they should work as spacers.
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