Unless you're looking for one of the special editions, you can just change the players. Happ sells most of the replacement parts. Canada, USA, and USSR players are all available as replacement parts.
OK, so there are other members of the CHEXX hockey fan club.
So. Like so many other things here, if enough of the minds here come together, there are some good ideas come out.
I figure I'd have to buy the dome, the nets, the players and the scoreboard to really get the look as a homebuilt replica. I will have to buy the gearboxes if I can't find a cheaper alternate.
I hope I can make the rest. The rods that drive the players, the tracks the gearboxes ride in, the chutes from the nets to center ice, the solenoid which fires the puck, some prox sensors... throw in a PC that can I/O with the sensors and solenoid, and some software to take input from boo buttons and coind door switches.... et voilla.
Should only take about a year of spare time.