Here is a link to a well done tutorial for creating 3D models of buildings using historic plans. This tutorial utilizes Inkscape for the vector data and Blender for 3D modeling. Both programs are available freely, for multiple platforms, under open source licenses and have active development communities.
This tutorial is created by Sanna Tammisto & Ari Häyrinen at 3D-Bridge. 3D-Bridge, “Transferring of Cultural Heritage with New Technology”) is a pan-European group the is established to foster heritage preservation through the melding of opensource technology with a mulitperspective architectural practices. As stated in the 3D-Bridge site, there objectves are:

  • The target of the 3D-Bridge project is to develop tools of new technology based on an open source policy for the research and preservation of cultural heritage.
  • The 3D-Bridge project will highlight the common European contents of regional cultural heritage research based on different geographic, ecological and cultural starting points.
  • The 3D-Bridge project will translate European cultural heritage into the language of future societies and media literate generationbels.

IF you are interested in this organizations like this, check out the recent post on IOSA.it, “Open Source Software and Open Standards in Archaeology”

*image property of 3D-Bridge