Oh, no. I only seriously used mIRC scripts to compile parts of E:SoR (which is now being compiled with some utilities written in C). Fishy compiles under TASM and uses devpac8x to convert it to a .8xp file.
tasm -t80 -b -i FISH7.asm FISH7.bin
And then use whatever is your favorite .bin to .8xp util.
Also, I tried to use SPASM to build the project, but for some reason, the program (FISH7) just crashes. I really should try to figure out how to get it to compile under SPASM, since doing it that way would make the thing a whole lot easier.