So I tried to merge in the lost episode changes into the latest wadsmoosh and run it.
Here is my modified wadsmoosh
These are the wads I used.
ATTACK.WAD
BETRAY.WAD
BLACKTWR.WAD
BLOODSEA.WAD
CANYON.WAD
CATWALK.WAD
COMBINE.WAD
doom.wad
doom2.wad
FISTULA.WAD
GARRISON.WAD
GERYON.WAD
lost.wad - 2.1 patched 4 episode version
lostepis.wad
MANOR.WAD
MEPHISTO.WAD
MINOS.WAD
NERVE.WAD
NESSUS.WAD
PARADOX.WAD
plutonia.wad
SEWERS.WAD
SUBSPACE.WAD
SUBTERRA.WAD
TEETH.WAD
tnt.wad
TTRAP.WAD
VESPERAS.WAD
VIRGIL.WAD
It had a few errors:
https://paste.ubuntu.com/p/WjgcJvypkt/
Processing IWAD lostepis...
extracting graphics_lostepis...
Extracting pk3/graphics/M_EPISOD.lmp
Extracting pk3/graphics/M_EPI5.lmp
ERROR: Couldn't find lump with name FINAL1
ERROR: Couldn't find lump with name FINAL2
ERROR: Couldn't find lump with name ITLEPIC
ERROR: Couldn't find lump with name M1ANI1
ERROR: Couldn't find lump with name M1ANI2
ERROR: Couldn't find lump with name M1ANI3
ERROR: Couldn't find lump with name M1ANI4
ERROR: Couldn't find lump with name M1ANI5
ERROR: Couldn't find lump with name M1ANI6
ERROR: Couldn't find lump with name M2ANI1
ERROR: Couldn't find lump with name M2ANI2
ERROR: Couldn't find lump with name M2ANI3
ERROR: Couldn't find lump with name M3ANI1
ERROR: Couldn't find lump with name M3ANI2
ERROR: Couldn't find lump with name M3ANI3
ERROR: Couldn't find lump with name M3ANI4
ERROR: Couldn't find lump with name M4ANI1
ERROR: Couldn't find lump with name M4ANI10
ERROR: Couldn't find lump with name M4ANI11
ERROR: Couldn't find lump with name M4ANI2
ERROR: Couldn't find lump with name M4ANI3
ERROR: Couldn't find lump with name M4ANI4
ERROR: Couldn't find lump with name M4ANI5
ERROR: Couldn't find lump with name M4ANI6
ERROR: Couldn't find lump with name M4ANI7
ERROR: Couldn't find lump with name M4ANI8
ERROR: Couldn't find lump with name M4ANI9
ERROR: Couldn't find lump with name M5ANI1
ERROR: Couldn't find lump with name M5ANI2
ERROR: Couldn't find lump with name M6ANI1
ERROR: Couldn't find lump with name M6ANI2
ERROR: Couldn't find lump with name M7ANI1
ERROR: Couldn't find lump with name M7ANI2
ERROR: Couldn't find lump with name M7ANI3
ERROR: Couldn't find lump with name M7ANI4
ERROR: Couldn't find lump with name M7ANI5
ERROR: Couldn't find lump with name M7ANI6
ERROR: Couldn't find lump with name M7ANI7
ERROR: Couldn't find lump with name M7LANI1
ERROR: Couldn't find lump with name M7LANI2
ERROR: Couldn't find lump with name M8ANI0
ERROR: Couldn't find lump with name M8ANI1
ERROR: Couldn't find lump with name M8ANI2
ERROR: Couldn't find lump with name M8ANI3
ERROR: Couldn't find lump with name M8ANI4
ERROR: Couldn't find lump with name M8ANI5
ERROR: Couldn't find lump with name M8ANI6
ERROR: Couldn't find lump with name M8ANI7
ERROR: Couldn't find lump with name M8ANI8
ERROR: Couldn't find lump with name M8ANI9
ERROR: Couldn't find lump with name M8EANI1
ERROR: Couldn't find lump with name M8EANI2
ERROR: Couldn't find lump with name M8EANI3
ERROR: Couldn't find lump with name M9AANI1
ERROR: Couldn't find lump with name M9AANI2
ERROR: Couldn't find lump with name M9AANI3
ERROR: Couldn't find lump with name M9BANI1
ERROR: Couldn't find lump with name M9BANI2
ERROR: Couldn't find lump with name M9BANI3
ERROR: Couldn't find lump with name M9EANI1
ERROR: Couldn't find lump with name M9EANI2
ERROR: Couldn't find lump with name M9EANI3
snip
extracting music_lostepis...
Extracting pk3/music/LE_E1M1.mus
Extracting pk3/music/LE_E1M2.mus
Extracting pk3/music/LE_E1M5.mus
Extracting pk3/music/LE_E1M7.mus
Extracting pk3/music/LE_E1M8.mus
Extracting pk3/music/LE_E1M9.mus
ERROR: Couldn't find lump with name
snip
extracting sprites_lostepis...
ERROR: Couldn't find lump with name 1
ERROR: Couldn't find lump with name 2
ERROR: Couldn't find lump with name 3
ERROR: Couldn't find lump with name 4
ERROR: Couldn't find lump with name 5
ERROR: Couldn't find lump with name 6
ERROR: Couldn't find lump with name 7
ERROR: Couldn't find lump with name 8
What am I doing wrong?