So, after adding even more mods (and updated ones), I now have some ponified companions, and here we have Piper Sparkles handling the VPG Mk 2 gatling plasma gun (of course, her getting it after battling at least 30 enclave shocktroopers, gutsies, and assaultrons in diamond city).
 
[Mods shown in picture] (for those of you too lazy to search for them yourselves…)
 
Plasma Gatling MK 2.6 by Ajumi: http://www.nexusmods.com/fallout4/mods/5534/?  
Diranars Gorgeous Glowing Plasma for Ajumis Plasma Gatling V1-0: http://www.nexusmods.com/fallout4/mods/7945/?  
(CaN) Crimes against Nature ADD-ON pony companions: http://www.nexusmods.com/fallout4/ajax/downloadfile?id=80603  
Better Dials for Power Armor: http://www.nexusmods.com/fallout4/mods/10937/?