The kids are available for commisioning. Prices start from a bag of lollies and chips.
I did some calculations using the info from the good book 'The dobsonian' for the secondary, and also measured the thing. It's all good. The actual secondary's minor axis is if anything a couple of mm oversize.
I think what's happened is that the actual put-together of the Odyssey may not be optimal, The tube may be a little short for the new mirror cell and spider. The original spider was just a single strip of metal sheet running across the diameter of the tube. Savings had to be made somewhere for the prices the Odyssey's originally were offered at.
Now knowing the optics are matched I'm not as concerned.
I'll still take you up on the offer Tnott, serves as a double-check,
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I compiled a list of ply components to be made, and the final assembled volume using a Highe design is the same as this current Odyssey (of the OTA). The outside diameter of the spider ring is the same as the Odyssey's tube.
However, that is where the similarities end.
Mental