I have four of the hd1k_... images I want to append to the base FZ80_std_hd1k_combo.img, the games, hitechc, z80asm, and fortran. My reading of the RomWBW User Guide shows using a command to concatenate them together, in dos I executed this:
copy /b FZ80_std_hd1k_combo.img+hd1k_games.img+hd1k_hitechc.img+hd1k_z80asm.img+hd1k_fortran.img myRomWBW_hd1k.img
It made a nice 82 MB image, which easily fits on my 128 MB (124 MB usable) compact flash drive. But when I boot with it, I see the games on drive I: and hitechc on J:, but no z80asm or fortran. I haven't found instructions on how to set a K and L drive visible. I'll keep looking, but a hint or two would be appreciated, too.