Cesar, I watched a few youtube videos on how to make one. My box is 4X4X4, it's made from some scrap wood I had around the house and I used a metal plate that I drilled holes into. I connect the vacuum cleaner from the side.
As far as detail goes, it all depends on the detail of the "buck" For obvious reasons, you can't vacuum form intricate details, or cavities where the suction can't reach.