How would you want to play it?
Okay so you could either be a rogue Mechanicus Forgeworld either with or without an STC or other valuable information.
This is the most dangerous option, as either way, the Imperium is going to fight to bring you back into the fold.
You could also be a Forgeworld who was never brought back into the Imperium during the Great Crusade, and is now making efforts at establishing your own empire of sorts.
This one isn't very dangerous, until you encounter the Imperium.
You could be an rebellious exploratory fleet, who found out about Necrons and spoke to some Crypteks, learned about the Void Dragon Ctan. Revelation. Etc.
Least dangerous for your faction fluffwise, as the Imperium may never learn about your rebellion.
Then theres the Dark Mechanicus, which is just chaos sponsored.
Those are the most likely scenarios.
As far as paint jobs, the first two allow you to literally do anything, but you'll most likely splash red in there in some way, as almost every Mechanicus Faction does this.
The Necron one will allow the most flair to it, since they could respect/worship the Necrons as the final goal of the Mechanicus, and therefore paint themselves in that color.
This could result in a alot of green accents and shiny silver, or you could base it on the Dynasty that they encounter.
The last paint is chaos. Make it chaos. Spikes, Blood, Warpflame. Whatever.
Finally, as far as models go, get War Convocation. Fluff really doesn't matter, but most Forgeworlds have a Knight World nearby as a defense measure, so you could base it around that.
An exploratory fleet might be taking some Skitarii in stasis or a Knight with them depending on their initial mission and the danger involved. Probably to collect an artifact/STC of some kind.
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