I'm nearly done with an 11x14 (which I plan to add on a 12x20 expansion back later). I used my Kodak 2-D 8x10 as my basic design model, but I added front tilt and instead of geared focusing, I'm using friction focusing (u-shaped brackets that fit on the outside and underside of the double base rail).
I started with the bellows--found off ebay and built the camera from the inside out around the dimensions of the bellows and, at the back, around the dimensions of the film holders.
I used aluminum square tubing with wood cross pieces for the base rails (a double rail like the Kodak 2D). My first set of rails are 36 inches. I plan to make a shorter 24 inch rail as well for backpacking when I will only need shorter lenses. The base rail has no joints or hinges so it is very solid (you could stand on it, no problem). The base rail will be lashed to the outside of my pack when hiking.
My design is very simple, nothing as elegant or complicated as Geert's or Jim's. Also, the only power tool I needed/used was a 1/4" drill, and I only used that to make starter holes for screws. Bolts and anchors came from McMaster-Carr. Other than the bellows, all the other materials came from the local hardware store.
As for problems, I just tried to think about each step of the design very carefully and take it one component at a time--front and rear frames, front and rear standards, base rail, then the back and gg holder. One problem I ran into was building the back frame before I mounted the bellows on the front and rear frames. I had to use a smaller bellows frame than I expected to get the bellows to lay flat against the frame all the way to the corners, so had to build out from the bellows frame to my originally-expected dimensions for the inside of the rear frame.
I found it easier to design the camera completely in my head and take the construction one component at at time rather than draw it all out on paper--I must not have an engineering bone in my body.
It's taken me about a month, but that could have been compressed into a week if I could have worked on it full-time. The longest part is doing the staining and finish coats and sanding and waiting for drying between coats. Also, weeks spent trying to find a bellows I could use.
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