I spent a portion of my weekend counting bricks. That's one of the many joys of working with old buildings. After a lot of correspondence with various people, I determined that even if any drawings of the abandoned Richmond Gas Company building do exist, it was going to be quite difficult for me to get them. So it was with that determination that the counting commenced.
I was lucky enough to get pretty much unobstructed access to the building. That allowed me to get over 200 pictures of the building. Based on that extensive catalog, I had either an interior or exterior shot that allowed me to estimate the dimensions of the spaces based on standard brick and CMU dimensions. I'm pretty convinced my SketchUp model is off at most by a foot or so in any direction.
And even if there are some dimension inconsistencies, the model is at least proportional. So now I have a pretty accurate representation of my space and can get cracking on my design intervention.
I'm pretty sure I'm adapting the space to a cultural center/museum, so its time to program the space. If there is anything in particular you think I should know about programming such a space, please let me know. As the building currently stands its mainly a shell of exterior walls, providing the opportunity for interesting interior architecture and how the new architecture does/does not touch the ruins. Furthermore if any more program space is needed I'm ready to design an addition.