One thing to keep in mind is that the meters on the other cameras very much average a scene. With an SLR, when you meter using the repeater window on the top of the camera, you must be more careful about where the lens is pointing.
The SLRs with the repeater windows that use TTL metering "read" a scene differently than those with the front-mounted CdS or selenium cells.
I think you should be OK with most scenes, but with a wide angle or telephoto lens, you'll want to be more careful because the lens might be reading different parts of a scene unintentionally.
Just something to think about as you move forward with this.