Your terminology is off which is part of the reason for our confusion.
A traditional Diving Kit consists of the following:
Exposure protection (Wetsuit, booties, gloves, hood)
Mask (not goggles)
Fins (not flippers)
Snorkel
BC (Buoyancy Compensator)
Regulator (Consists Primary mouthpiece, Secondary mouthpiece, Gauges, BC [air supply] inflator hose)
----> ie. you should have 4 hoses, 2 on the Diver's Right, 2 on the Diver's Left.
Tank
Lead Weights
Weight System (to hold Lead Weight)
If you want to break it down further into gear specifics: material, mixing/matching/optimizing, you're opening up a scuba lecture.
For your 3D model, make sure nothing is dangling or dragging off the diver. Everything should be stowed and clipped off. That's one of the biggest faux pas we divers groan about when we see Divers in media.
Another is mirroring the regulator. There's a right and wrong side to put the breathing part & the pressure gauge part.
Primary & Secondary breathing mouthpieces should be on the Diver's Right Side (Diver's perspective), Pressure Gauge should be on the left, BC inflator hose should be on left. Snorkel should be on the divers left side of the mask.