psmeathead,
if you have a header board at the door ways remove it and you will have to remove some of the older floor to weavin the new floor if you like the look of it all being install at the same time. unfinish floor is easy to get. sand everything to match the color you are looking for. your job is easy. if you would like to see what a weavin is take a look a our web site at
www.delawares-finest.com and look under staircases and pictures click on before and after floors go down about ten rows and you will see it.
Jeff