You can cut a lot of stuff with 3-axis gantry machine. I use it to cut spearguns of my own design for example, It's a bit tricky to make a precise machine with a lot of Z-depth though, but you can turn around the material and mill from both sides (double the depth in that case). Pretty much anything can be done on that machine. In hindsight, I should have maybe gone with a fourth axis too (rotational) since that would suit me more in this case.