...I was able to delete the different applications that came bundled with Workbench that I didn't need, to free up to a little more than 100KB's...
The following are files that can usually be deleted from a copy of Workbench 1.3 to make a customized bootable disk for other applications. I'm sure no one needs to be reminded to NOT modify the original!
from C:
Avail, Break, Changetaskpri, Diskchange, Diskdoctory, Edit (you might keep Ed), Else, Endif, Endskip, Eval, Failat, Fault, FF, Filenote, Getenv, IconX, If, join, Lab, Lock, Protect, Quit, Relabel, Remrad, Rename, Resident, Search, Setlock, Setdate, setenv, setpatch, skip, sort, stack, status, wait, which, why. These are mostly used in scripts.
from Devs: clipboard.devise, narrator.devise,
from Fonts: Everything. Keep the empty directory for App specific fonts to be added.
from L:
Aux-handler, FastFileSystem, Pipe-handler. Speak-handler
from Libs: the math libraries if the app doesn't need them, translator.library
from Prefs: CoipyPrefs, Prefs (with the proviso from Mike, above)
from S:
Dpat, PCD, Spat, Startup-Sequence.HD, StartupII,
from System:
Fastmemfirst, Fixfonts, Initprinter, Mergemem, NoFastMem
from Utilities: Everything with the possible except of More, in case you want to read the app's documentation.
Some programs like astronomy, rendering, calculators, etc might need the math libraries. I hope this helps.