The Century M53/MG42 semi has been a long time in work. Wiselite did indeed build these, and I know of some people involved with it, so the ones that were built are top notch. In fact, new owners on mg42.us report that they work right out of the box.
I don't know how many kits Century had. But I do know the project turned out to be much more difficult than expected. I have a hunch that Century/ Wiselite won't be building more than this first batch (I hope I'm wrong). If they do, I'd expect that the price will increase drastically.
CFS had them on their latest SGN ad, so I called CFS. They received only three, and have a backorder for 139. I didn't bother to add my name to the list.
BTW, Century/ WLA will not sell to NY state, despite these firearms being perfectly legal there.