Well there you go.
I'd suggest removing chest and shoulder pieces, using Protoman's jumpsuit as basis (arm pieces/belt/boots blue, shoulders black, torso and legs cyan), and perhaps making Maestro a little shorter.
As for his helmet...
(http://puu.sh/oMbHI/3e90feede8.png)
This is the best I could make: a mixture between "Sniper Joe" and Doomguy's helmet. A face-covered, slightly oval-shaped helmet with few linear marks on his jaw area, his ear pads and over his "eyes", a black monitor display acting as a visor with two digital eyes a-la Galaxy Man (with no physical separation between it and the lower/upper parts of the helmet, flat and uniform), and a single protusion on the front top that very slightly comes down.
While I see that making the design as basic as possible is an important design choice, it's also good to keep the refrence to NormalNavi intact. Making them too basic will start making them look too much like someone's megaman edit OC, instead of a nod to BattleNetwork
also i think the male/female variants are already perfect
Some of the more recent edits, especially Korby's edit, look pretty good
Though, the 1 pixel wide eyes look... off. Maybe because they look fine on Astro's, Turbo's, and Galaxy's tiny heads, but not too good on a big ol' megaman size head
I'd also say thin out the upper portion of the leg armor a little bit, Normal Navi have thin legs until it reached the feet. While we are making it look more classic series yes I'd feel it might be worth a try to see if that might make the design more accurate while still looking decent. Of course keeping the coloring as is and not more in tune of the navi though.
Maybe
Shoulder pads = yes
Upper arms and legs = Black
Arms and legs = Blue
Hands and feet = cyan
Torso = Blue with a Cyan gem on front and cyan piece on back
Head = Korby's last one maybe?
We ARE basing it off this thing here remember, and it already has a rather bland generic look for the series.
(http://vignette4.wikia.nocookie.net/megaman/images/9/91/NetNavi_Concepts.jpg/revision/latest/scale-to-width-down/640?cb=20140416062634)