most of the phone stuff ive found is simply "install program and use it to take measurements of buildings as you walk around and make way points in the program."
I had thought of Inventor or Solidworks, but the options available are well not for me anymore.
Most of the programs talk about importing a pdf file and using it to make drawings from.
My issue is I have a fondness for early trains and rail road carraiges, and most of the things I have are saved in PDF files that were made from E size sheets. I have no where in 150 miles that can print something that big, and im not going to send it out for mail delivery. At the same time some of the drawings lack measurements in some sections, but the entire drawings are set up at full size, just toss in your own dimensions.
SO how many of the programs will let me bring in a PDF file with a drawing in it, use it as a base layer and let me trace over it to make a drawing from? Inventor in 2008? was given a feature of bringing in photos and existing 2D drawings of an object and making a 3d model from them.