in the past (.91a) i played as a "remnant" faction as in i would use droneships in both my and my planets defence fleets. to to this i used the method described in this post:
since 0.95 this didn't fully work anymore and only added modded remnants to my build options (worked fine for derelicts though).
where i could just install a blueprint mod and spawn that blueprint in to unlock the vanilla remnant ships.
Spoiler
{"enabledMods": [
"AI-Retrofits",
"adjustableautomatedships",
"archeus_beta",
"lw_autosave",
"HMI_brighton",
"clearCommands",
"lw_console",
"istl_dassaultmikoyan",
"diableavionics",
"XLU",
"GrandColonies",
"HMI_SV",
"HMI",
"IndEvo",
"interestingportraitspack",
"Imperium",
"kadur_remnant",
"kingdomofterra",
"lw_lazylib",
"ArkLeg",
"mag_protect",
"MagicLib",
"Mayasuran Navy",
"nexerelin",
"OcuA",
"Ocutek",
"ORA",
"phaseFieldFix",
"portrait",
"roider",
"sanguinary_autonomist_defectors",
"tahlan_scalartech",
"SCY",
"shadow_ships",
"holdsforall",
"speedUp",
"superweapons",
"Sylphon_RnD",
"tahlan",
"Terraforming & Station Construction",
"exalted",
"star_federation",
"ultra_drive_field_stabilizer",
"underworld",
"UNSC",
"vic",
"vayrashippack",
"XhanEmpire",
"prv",
"shaderLib",
"mir_nr",
"G1GC_Hide_Leak_Message"
]}