Please don't. It is to everyone's benefit if we can come up with a real compromise. But I have not found one.
I can only put it this way:
Whether we like it or not we are currently getting a magic ship transport, they can call it 3D printing or anything else but the outcome is the same. Somehow, in a universe without FTL communications, the shipyard is making a perfect clone of a used ship with mods and then, incomprehensibly, dismantling or selling the original ship. For me that creates major lore problems and only makes one side happy. I think rentals, if done correctly, are an easier pill to swallow.
The rental compromise gets the ship in the hands of the instant side by taking what should be a naturally occurring rental market and getting them a ship now. Yes, you have to accept that the ship is functionally equivalent to the owned ship, I would prefer it to be a close model with similar but not exactly the same specs but I fear that's a bridge too far and would require recoding on FD's part. I don't see an issue with the rental facility having modded ship components in principle, they may be used ships with mods or "aftermarket" mods commissioned by the rental facility.
As to the original ship, if you are renting you still own your owned ships. Your owned ships still show up on the galaxy map. FD would write the code that once you transferred from a rented ship to an owned ship the rented ship is returned. Again I would like to see a future enhancement that applied fees to the transaction with fines and theft charges for not returning at the end of the term but that might take FD sometime to implement, if at all.
As to your owned ships, and the fact that the "instant" ship is a rental, you still need fleet management. By solving the instant need with a rental, proper fleet management could be added to move ships from any port to any other port for a low cost, it's slower than instant and likely in bulk so that's a trade-off.
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Indeed! The rental idea is not bad, but should be made into that: Leasing a ship for a limited amount of time. The selection available should depend on system size and randomised factor such as potential already rented out ships etc. And the ships could be in all sorts of conditions and degrees of modification.
Just as with rental cars, the perfect model might be there, but is probably rented out (or broken down).

S
That is exactly what I want, a lease period. I could foresee fines and a wanted status for failing to return on time. The issue there, today, is that FD will being dropping this in beta and likely in the release. For now, I'm willing to accept the compromise of simply calling instant ship transfers a rental with an unlimited time period, for promotional purposes. Once you switch to an owned ship the rental is returned. Down the line FD could have time to tweak the system.
In the mean time, without taking a compromise with a possible future, we are going to have to accept magic ship transport or 3D printing as an explanation with no future.