I wrote a letter to the VASA Museum asking if they could give me drawings. I look forward to a reply. There are VASA ship drawings on the internet but I don't know if they are accurate. I don't know if the ship form will be good. Therefore, it would be better to get drawings from the museum.
When I start constructing, I'll be sure to share how I'm doing in this forum.
The drawings we used to sell (the ones Tromp refers to) were at 1:100 scale, and were reductions of the original hand drawings at 1:50. To my knowledge we have never produced drawings at 1:48. What we currently have available are the old 1:100 drawings as digital files (PDFs), which can be printed at any scale desired - these are what we will be sending you.
As for accuracy, they show the hull form reasonably well, although they do not show the actual assymmetry in the hull. When we were developing the partworks kit sold by deAgostini, it proved to be uneconomical to incorporate the differences between port and starboard into the kit. The hull shape differs, the gunports are in different locations, etc. It would be up to you how much of this you wish to incorporate, but we can supply some information on the larger differences.
The drawings have some detail errors, but they appear to be the drawings used by ZHL in developing their carving set(as far as I can tell - we have not had any contact with them so I do not know with certainty what source material they used). This means that at least the carvings should match, more or less. I note that the majority of teh ZHL sculptures are more or less flat on the back, which will create some challenges when mounting them to the actual curved surfaces of the hull. I am looking forward to someone building a model with them, to see how well they work out.
The next volume in our publication series after the rigging volume appears will be about the hull, and will include a comprehensive set of new, accurate drawings, probably at 1:50. These are based on a complete digital survey of the hull, and will include all of the irregularities and assymmetry of the original.
Indeed the plans I have are in 1:50th scale and not 1:48. I'm sure the difference in scale using the 1/48th scale sculpture set for a 1:50th scale hull will hardly be noticable and isn't really worth mentioning.
A build-log of a scratch built 1:50 model in this Forum would be quite a thrill! I might be tempted to join in; we could do a Group build!