compressed, includes stripped and compressed totala1.hpi
replace your existing totala1.hpi with the new one, which has had all of the maps removed.
put the map file in you TOTALA directory and you can now remove AA I, AA II, NUGGENMAPSv2, BTMAPS, CCMAPS, 12 cavedog downloadable maps, TAT map pack
rev31.gp3 should be the file you keep, as it contains the mod itself