It's obvious by looking at Kevin's examples that these type of alterations can and have been done,but I'm not too convinced that just anyone could pull off a "re-fronting" job that would fool all graders and collectors.There is no way,unless you are a pro like Kevin,that you could "build" an example that could fool everyone,IMO.I would guess there may be a handful of people who could do an "undetectable" job-my point is that I do not think it's as easy to do as it sounds,that's all.
I admit,it is scary-but I would be a little more leary if I were buying these ultra rare,one of a few known,high dollar,bionic back cards........
Clayton