Gentlemen, I submit to you my current endeavour - one for which I am very enthusiastic.
Below is the non-working code I have tried thus far;
[CREATURE:ROACH_LARGE]
[DESCRIPTION:A small insect that seeks out unwatched food and garbage. They fear light.]
[NAME:large roach:large roaches:large roach]
[CASTE_NAME:large roach:large roaches:large roach]
[CREATURE_TILE:249][COLOR:6:0:0]
[NATURAL][PET]
[PETVALUE:5]
[BIOME:NOT_FREEZING]
[VERMIN_EATER][PENETRATEPOWER:2][VERMIN_HATEABLE][VERMIN_GROUNDER]
[VERMIN_NOTRAP]
[POPULATION_NUMBER:250:500]
[trIGGERABLE_GROUP:5:50]
[SMALL_REMAINS]
[SPEED:2900]
[PREFSTRING:ability to disgust]
[FLIER]
[ALL_ACTIVE]
[NO_SLEEP]
[HOMEOTHERM:10071]
[SWIMS_INNATE][SWIM_SPEED:2500]
[MUNDANE]
[NOT_BUTCHERABLE]
[NOBONES]
[BODY:INSECT:2EYES:HEART:GUTS:BRAIN:MOUTH:2WINGS]
[BODY_DETAIL_PLAN:CHITIN_MATERIALS]
[BODY_DETAIL_PLAN:CHITIN_TISSUES]
[BODY_DETAIL_PLAN:EXOSKELETON_TISSUE_LAYERS:CHITIN:FAT:MUSCLE]
[BODY_DETAIL_PLAN:STANDARD_HEAD_POSITIONS]
[USE_MATERIAL_TEMPLATE:SINEW:SINEW_TEMPLATE]
[TENDONS:LOCAL_CREATURE_MAT:SINEW:200]
[liGAMENTS:LOCAL_CREATURE_MAT:SINEW:200]
[HAS_NERVES]
[USE_MATERIAL_TEMPLATE:ICHOR:ICHOR_TEMPLATE]
[USE_MATERIAL_TEMPLATE:GOOP:CREATURE_EXTRACT_TEMPLATE]
[STATE_NAME_ADJ:ALL_SOLID:frozen roach gas]
[STATE_NAME_ADJ:LIQUID:liquid roach gas]
[STATE_NAME_ADJ:GAS:roach gas]
[MATERIAL_VALUE:100]
[DISPLAY_COLOR:7:0:1]
[ENTERS_BLOOD]
[PREFIX:NONE]
[SYNDROME]
[SYN_NAME:roach gas]
[SYN_AFFECTED_CLASS:GENERAL_POISON]
[SYN_IMMUNE_CREATURE:ROACH_LARGE:ALL]
[ENTERS_BLOOD]
[SYN_INHALED]
[CE_VOMIT_BLOOD:SEV:900:PROB:99:RESISTABLE:SIZE_DILUTES:LOCALIZED:START:50:PEAK:800:END:3000]
[BLOOD:LOCAL_CREATURE_MAT:ICHOR:LIQUID]
[CREATURE_CLASS:GENERAL_POISON]
[GETS_WOUND_INFECTIONS]
[GETS_INFECTIONS_FROM_ROT]
[USE_MATERIAL_TEMPLATE:PUS:PUS_TEMPLATE]
[PUS:LOCAL_CREATURE_MAT:PUS:LIQUID]
[BODY_SIZE:0:0:1]
[MAXAGE:1:1]
[SECRETION:LOCAL_CREATURE_MAT:GOOP:GAS:BY_CATEGORY:ALL:CHITIN]
[CASTE:FEMALE]
[FEMALE]
[CASTE:MALE]
[MALE]
[SELECT_CASTE:ALL]
[SET_TL_GROUP:BY_CATEGORY:ALL:CHITIN]
[TL_COLOR_MODIFIER:BROWN:1]
[TLCM_NOUN:chitin:SINGULAR]
[SET_TL_GROUP:BY_CATEGORY:EYE:EYE]
[TL_COLOR_MODIFIER:BLACK:1]
[TLCM_NOUN:eyes:PLURAL]
I desperately hope that there is something I can repair in this, and that secretions aren't hardcoded in some insurmountable way to work on "big creatures" only.
Thank you for your time.