The dragon wrench is a tool that can be used in a lot of situations. It is versitile and can fit almost any lock you can find. I have found it very handy, and is nice to have in your set. You can make one with some difficulty, since they are not very well known. The wrenches can be used for tubular, wafer, cylinder, and fits nearly all the brands.
I do not know if this has been posted before, I searched for it on this forum, but if it has hopefully someone uses this knowledge.

there is the basic idea. Of course you can modify it to your own liking. You can add more wrenches, or even picks. It would be interesting to make one like this except with picks, instead of a variety of wrenches. Good luck, and when making this, I recomend a cheap piece of metal you can get at a hard ware store. Cut out a piece that is about the size you want, and then use a metal grinder to mold it to your liking.
Just be sure to dip it in water frequently while making it!
Good luck, and you will have to use locks to decide how large to make this.