jonherries: We had a similar lack of space under the house and as part of our reno removed TONNES of soil from under house and put down plastic sheeting (on my belly with a scraper, hand trowel and flatish container). That made a massive difference to our house in terms of damp/smell of “old house”.
Out of interest, how long did this actually take you? and what's the floor area? Might be another project for later..