Take pictures of disassembly (lots and lots of pictures).
Take pictures of subassemblies as they come apart.
Every time something comes off/apart. It gets bagged in a (sequentially numbered) heavy duty freezer ziplock bag. The bag is labeled with every part that is in the bag (washer x2, screw x4, etc.), every part that is suspect/broken/missing is added to a list of parts that need to be fixed or replaced with it's corresponding bag # so when it's time to find those parts later, you're looking for a bag #, not a needle in a haystack. Only put a small number of screws/nuts/bolt/etc. in each bag to keep it manageable.
Some would add a picture of the sub-assembly to the contents of each bag but, it seems nobody prints pictures anymore
If you don't have lots of shelves, build or buy some. It's amazing how much space a disassembled car consumes. I box as much as I can. Label the boxes. You can never have too much info or too many pictures.
Take pictures of the routing of hoses and wires. Lots and lots of pictures.
If you're having your hardware plated, I've seen some people wire them all together. I've never done this but, you could wire the contents of each bag together as a group so they stay together. Maybe someone has a better idea on this.
Tim K