That is a very interesting little tool! I'm not much into making my own buildings but if I were, I can see how that would be useful.
Below, you can see the top drawer (and probably the most used) of three drawers that are full of useful little tools I use on a usual basis. Nothing that really stands out, just regular stuff's. Most of this stuf is used for scenery. The next drawer down (not shown) has more to do with trackwork and electrical tools.
