So, any of the devs knows if this can build or not? I saw minidlna being merged into tomato-ND-USBmod, however I don't see any references to the K24 version in the Makefile, only the K26 version.
Adding minidlna increases the firmware size by almost 1 MB. This means it will not fit on routers with a 4MB flash. The standard 2.4 builds will just barely fit in 4MB, but only a stripped 2.6 will fit in 4MB.
The next larger available flash size is 8MB, and all the 2.6 builds will fit in 8MB.
So, while it is certainly possible to add minidlna to a 2.4 build there is no advantage to doing so. It ain't gonna fit in a small router and a large router can easily run 2.6.