Paul,
The application requires a large number of hours in "Project Management' - but that it is very, very, broadly defined and does not require multiple employers or multiple different kinds of projects. I believe there was a podcast on PM Podcasts where Cornelius interviewed a woman who was her own General Contractor on a house that she designed and built as a listed project on her PMP exam. (It was a fascinating podcast but I do not recall all of the specific details.)
My experience was that as long as you met the time (hours within years) requirement, it will be accepted. Just make sure that when you fill out the application you follow the prescribed format exactly because you have only a few words for each project to demonstrate that you actually managed the project, not that you were simply a team member.
Good luck.
