This is my first attempt at a DIY dslr cage. At lot of thought went into the hole / tap layout on the plates. I have numerous plans for extending the use of the plate beyond the dolly and cage. The total cost of the project, for everything you see, was $46.
It is rock solid and can handle a 5d without fear of tipping over.
Cage is 11" wide x 2.5" deep x 7.5" high. The plate is .5" thick x 2.5" wide by 11" long