I just wanted to put a bit more engineering input into this matter. I've studied the shell and other components further, I also did some research about SD Card sockets.
First of all, the battery is 3,8 millimetres thick and not so surprisingly, measurements reveal that the space available between the thinnest parts of the shell in the kickstand region and the display assembly is also 3,8 millimetres.
In my earlier post I gave some dimensions for the full size SD Card and also for the Micro SD Card.
Minor clarification and adjustment to the Micro SD Card dimensions. As everyone whose handled these memory cards knows, there is a thicker section at the end of the Micro SD Card to aid its extraction from the socket. Thickness for this section is 1,0 millimetres, the rest of the Micro SD Card is 0,75 millimetres (measured with Vernier calipers) thick.
I haven't done exhaustive research about the SD Card socket dimensions, but the Molex SD Card socket has a thickness of 2,95 +/- 0,15 millimetres. I imagine that this is typical thickness for these sockets.
The current Micro SD Card reader PCB is 0,5 millimetres thick. And the threaded screw posts are 1,7 millimetres tall.
So the available space is 3,8 millimetres and using the above dimensions for the PCB and full size SD Card socket, one gets a thickness of 3,6 millimetres. This comes from the upper limit tolerance full size SD Card socket 2,95 + 0,15 = 3,1 millimetres and PCB thickness of 0,5 millimetres.
Obviously the PCB for the SD Card reader cannot just sit flat on the shell inner surface. It needs to be electrically insulated and also attached probably with screws. And one has only 0,2 millimetres for these two functions to be fulfilled.
And to put this into perspective: A sheet of paper with weight of 98 grammes/square metre (a bit heavier than normal office paper) is 0,15 millimeters thick.
If I remember correctly, normal office paper (about 70 grammes/square meter) is about 0,1 millimetres thick, so we are talking about two sheets of paper...
So, my conclusion is that it would be an interesting and time-consuming challenge to have a full size SD Card slot in the V.
Is it doable? Probably, but my two concerns are that it would take a lot of time to engineer this change and it could also potentially weaken the shell structure so that it could deform or crack even from a small impact.
And additionally, it would probably require a bespoke card reader PCB to be developed for the V, as I doubt that there is a ready solution available on the market.
But please, try to find one and this discussion may lead to the V having a full size SD Card slot. The maximum width for the PCB is something like 40 - 45 millimetres (dimension between the battery and the shell inner edge).
So my vote unfortunately has to be against this change with the so far available information.