Just to clarify a couple of things, you can (and are of course welcome to) either make a model yourself or get someone to model it for you and submit to the mod either as an open-use ship or a "unique" ship (only available for specific player/groups) but the model has to be an original design, which is why models "too similar" in design to ships from other games or movies aren't acceptable. This is not really a matter of copyright (well, it is, but that's not the main reason) but moreso part of the Disco development standards - During the earlier days of the mod, there were ships that used models that were either direct imports (a good number of Star Wars and Homeworlds ships, as well as a few others) and also some which were "heavily inspired" by ships from other franchises, but over the years the bar was raised and such models were no longer considered acceptable, and the existing ones were also replaced over time (you can still find the old "import" models if you look through the outdated pages on Wiki).
So, the reason people are saying what you're proposing isn't really going to happen is because "imports" aren't allowed in Disco anymore, not because a regular player can't submit a model to be used in the game (which they most definitely can, as is the case with the majority of our non-vanilla ships which were made by players, not dedicated "model devs"). That said, as already mentioned in this thread the pics you posted are actually quite similar in design to Liberty snubline, so maybe you can find a ship in that line you're happy with.
tl;dr - Players can submit models to be included in the mod, but those models have to be original designs. The one you're proposing is not an original design and so it can't be added to the mod.
As it appears you have been here for a while, you have probably seen the 'firefly' ship.
That *used* to be a pretty close copy of the ship 'Serenity' from the series "Firefly", but if you look at it now it pretty much only shares the name with that ship these days.
At one point we had several ships that were clearly from the game 'Homeworld' as well, but they have gone also.
Discovery has many, many non-vanilla ships that are (or *should* be) unique to the Disco mod, which is what the Admins here are trying to achieve.
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Discovery is trying to maintain and stay in the course of the Vanilla story. That is including ships etc. Right now, since 4.85 its been purging out lots of imports from its files and replacing with custom and creative models. Getting this in-game will be taking a step back from replacing imports. The Warhammer can be modeled, yet the chances of getting it in-game are like firing a bullet to a piece of floating hair in the wind.