Can someone give me some dimensions for a 212 cab, or post me a link with some plans on it. All the ones I could find led to old non-working sites. Just a basic 212 with an open back is what I am going to build. thanks
You don't need to worry about precise dimenions for an open back cab, just make sure the speakers fit.

If you're doing a closed cab then you need to get the right cabinet volume if you want to achieve optimum low frequency response