Steinberger, Status and Gus all use completely different fabrication techniques.
Steinberger use an injection mould based system with graphite fibre impregnated resin. A bit like fibreglass reinforced bitumen or concrete. I like these necks, they're warm sounding and fairly consistent. Everything that a graphite neck should be.
Status (and Modulus) use monocoque construction which is the same technique used for making Formula 1 parts. That involves lining a mould with up to three layers of resin impregnated, woven composite sheets in the same way as fibreglass. It also gives the manufacturer control over directional stiffness through orientating the sheets in different directions as they're laid down. However it can produce issues if the design relies on a phenolic fingerboard for strength. Modulus had issues with their necks for both Alembic and Musicman due to the phenolic (aka Bakelite) fingerboards not being stiff enough in the early-mid 80's and then Modulus again around 1994. I've played necks by Vigier and my own Alembic which are superb but arguably over designed. The 80's Status Series 2000 basses also have fabulous necks when properly dressed.
Gus, as has been mentioned, use pre-impregnated carbon fibre sheets wrapped around a wooden core. I think Status have used this technique on bodies as well. It's practical, relatively easy to set up and some forms don't even require a kiln to set the resin. There's a nice dampening effect from the wood core but still a feeling of evenness and consistency across the whole fingerboard. Rob played around with dampening in the Stealth 2 basses, injecting epoxy foam into the hollow shell, and it resulted in instruments that were still characteristically bright sounding in that Status way but with a pronounced upper midrange purr.
Graphite composite neck, resin body. Status did something similar with it's Series 4000/5000 basses. A bass with a graphite neck needs some form of dampening for it to accentuate the warmer sounding frequencies. Traditional choices of ash or alder are too bright, mahogany is nice (and I used it on my self build) and maybe there are some softer, cheaper woods like paulownia or tulipwood which might work as well. Steinberger used maple in it's M series instruments which produced some pleasant sounding instruments but perhaps that wasn't just down to the wood.
He actually messaged me last night and revealed that he's almost overwhelmed by emails these days. Last night alone he had thirty to respond to so yes, it seems like there's always a chance he might miss one or two. A call seems to be the most reliable way to get in touch, as I suggested before.