There's a group of guys around here building those things. You can search "Bay area engine modelers" (BAEM) for more info. They show up at most of the bigger car shows and set up a display. They are simply awesome to see and hear in person. You get a close up of unfinished engines and see the detail. My favorites were the miniature Harleys. They've got a little of everything from VW to four cyl Offys, and even supercharged as the one in the video. You can buy a very rough cast kit that needs all the machining finished, a true test for any gear head.