Professional track layers will cost a lot of money. Please keep in mind that there are plenty of guys around with track building experience who may be able to help build track. A rough figure to have a contractor come in would be around $4,000-$8,000 per week depending on if they need to bring or rent machines. That is a big chunk of money. Personally, I think it would be nice to try and use volunteer labor with a good leader. Try to organize track laying weekends a couple of times and see how it goes. At the WW&F, with no machines, our record was 1200' in a weekend.