Here is a camera that I built a couple of years ago. It took me about a year and a half to build in my spare time. I built the film holder first, then built the camera around the film holder. The hardest part seemed to be making the bellows. I am now designing a 14" x 17" camera. It will have its own built in rear extension. It will be similar to the Korona Pictorial View camera. I have 2 film holders that I purchased on Ebay, and will be building the camera around them.