We have a company that does business here in Western Massachusetts and parts of New York that specializes in moving houses and installing foundations under existing houses. They run several steel beams under the house, extending beyond the house for jacking points. They even create collars to support the chimney during the lift. They use boxed timbers as safety supports and when the building is high enough excavate the new cellar hole with a bobcat. They've done it often enough to think through all the problems... hatchway to get the inside concrete forms out of the building, notches which become window holes for when they lower the building and remove the steel beams. Locally there are a lot of summer homes that were originally set on piers. Many from New York City are purchasing these and creating year round homes, it's not cheap.. $30 to 50 grand and if it was me I would just build somewhere else. But it's an interesting project and even more enjoyable when they take these buildings to another location !
Happy modeming, Bill