Convert some 2D house plans and drawings into Sketchup.

I have some old house plan drawings that I want to convert to a Sketchup and/or Autocad model. I own the house which is an old but very simple farmhouse with some outbuilding extensions. The drawings that I have were done by an engineer a long time ago and unfortunately I don't have the original autocad drawings any longer. Anyway, I would like to get plans drawn up showing the house in its current state using the sizing from these plans as a guide along with other drawings and photographs.