Can't see this ever happening.
Ships aren't modular.
For the most part the original concept art wasn't showcasing different possible configurations of a final ship that it would be possible to choose between. It was showing possible designs for the final ship.
Some of these different designs had varied configurations for things like the cockpit canopy.
Such as this:
There were other designs showing potential configurations for the big ships, the Anaconda having different hangar modules for example. But the outward design remained the same.
Some of the ships could have modular components cf. Anaconda. But the smaller ships, no. There's just no room for it.
At some point in the future it may be possible to customise a ship, we already have limited capability now, but I can't see it ever being possible to change the basic design.