Revolution Cabinet Plan

Thanks! Yeah, saw that, which with a picture to scale off of is good enough for a decent DIYer and presumably the local cabinet maker, but he wants blueprints, so the plans are probably [a lot] cheaper than having the shop do it.
 
Front Baffle Diffraction Treatment

For the front baffle, which one is better between a 45 degree chamfer, a 1/2" roundover or a slanted chamfer like the picture below?
 

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The oval PR from SBA has only small linear excursion , too stiff a suspension!

And the straight plane segments of the paper cone are easy to vibrate , add a damping pad there on both segments ...

This PR is only suited for low playback volume and not so low tuning frequency!