You can purchase plastic-capsule cartridge style fuseholders at Radio Shack or auto parts stores and install them under the chassis with very little effort. For a slightly more "period authentic" installation you can also purchase bakelite panel-mount fuseholders- however, these will require drilling a hole in the chassis.
I kinda prefer the "chassis mount cartridge style" fuseholder, which is just a plastic base with two metal clips that hold the bussman-style fuse. This is the style that many German-made sets of the 50's used. The downside is that if you mount it on top of the chassis where it is easy to access, you will have line voltage exposed at the terminal clips. But, who wants to live forever?