The first ship with multicrew is the Adder.
The Adder has only one additional seat (understandable as, without ship-launched fighters, accommodating a third player would be pointless).
My point is that the facility to multicrew with more than one other player has been put beyond the reach of all but the few. This seems like a needless limitation, especially given that even SLFs are already a fair way off for new players.
For example; I've been playing casually since beta and had only just reached an A-spec Asp Explorer after 2 years. In anticipation of being able to play with both my nephews, I worked hard to get into a badly-fitted Federal Gunship in anticipation of the fact that it would be big enough accommodate three of us.
Now it transpires that was a pointless effort as the 3-player experience is reserved for owners of top-end expensive ships.
Maybe an auxillary control pod internal slot module or similar could be provided to make multicrew a little more accessible.