I did send for a set of plans on CD for the Acto grinder, but wasn't overly impressed, it probably works very well but is built mostly of chunky MS sections and just didn't fancy making it. At the same time a set of Kennet castings came along which I really enjoyed making but don't use very much to be honest, still do things freehand.
There used to be a set of plans available for the Colyer Caseley grinder , I think from Bristol SMEE that looks fairly simple and cheap to build and according to the builder of one I spoke to at an exhibition works very well, certainly a lot less work than a Quorn type. I'm sure google would reveal more. I have tried a Quorn with a view to buying it but after using a Clarkson at work found it to be an infuriating thing to use, as someone once said " like shaking hands with an octopus" . They do however look to be suiperbly versatile in the right hands, which mine are not.
Dave