Easy to Print & Assemble Design
The Locus Helmet helmet is one of the most geometrically complex of the legacy Halo helmets. Because of this I utilized a multi-part, pin locked design. 
 
The Up-Armored Face Plate as well as Neck Seal are both magnetically attached (or attached via custom clips).
 
Instructions for assembly as well as a large collection of pictures/videos included in the build guide!
 
Multiple Visor Options
This helmet historically has no visor and relies on internal optical sensors/camera for the users vision, but to simplify things I included two different visor options.
There are two bucks included for vacuum forming, one for a small more concealed visor between the UA plate and the Face plate, and a second buck if it is desired to make the entire UA plate itself a visor.
To keep the original look, you can experiement with a matte metal finish rather than chrome on your vacuum formed visor
 
Fan/Speaker Compatability 
The Locus Helmet comes with built-in side speaker support as well as  side fan/ventilation compatability. All can be powered via additional storage space in the Side Vents behind of the fan housing
 
There are multiple functional vents around the helmet as well as a nasal opening to prevent visor fog and help un-obscure your voice.
 
 
Side Attachment Suite
The following attachments are included and compatible with this helmet via the attachment ports and attachment rails.
CNM
CNM[5]
HUL
HUL[3]
HUL-I RS
Purrrfect Audio
 
Dedicated Build guide:
All video instructions, tips, product lists/hyperlinks and photos can be found here