You can easily build an in 1:2e9 scale replica of the Solar System. You'll just need a 90cm sphere to use as the Sun, some 4-5 km of area do arrange things and a paquimeter for measuring the planets. At this scale, everything is just about as big/small as one can manipulate.
Bu you won't be able to place the Voyager in there. For that you'll need a car and a road trip.
The one close to me is in Helsinki-Espoo:
http://www.waymarking.com/waymarks/WM8AJ4_Ursa_Model_of_the_...
But this one's slightly bigger, scale is o to billion. You can still see the Sun from Neptune, if you have binoculars (4487 meters, the Sun is 140cm in diameter).
Bu you won't be able to place the Voyager in there. For that you'll need a car and a road trip.