You can purchase Vasa I from our distributor, Oxbow Books (Casemate in the USA), and they are accessible on line. The ship plan sets are no longer available on paper, since we have decided not to reprint them. We are in the process of producing an entirely new set of drawings based on a thorough digital documentation of the ship. The old modeler's plans are avalaible as PDFs from me - I will find a way to post them here so that everyone can get them.
The old plans are available as PDFs, for those who still want them. If we had a spot here I would be glad to post them. I anticipate it will be a few years before the new ones are complete, since they will be much more comprehennsive (it should be possible to build a new ship from them).
The PDF format I have has files sizes for the seven sheets between 300 kb and 1.4 MB. One of the smaller ones is below, to give you an idea of resolution in this size. I think that this is too small a file to be useful to modellers, but that is up to the user.