1)Position. You will have to build some studwork to accomodate the cistern and frame, which itself could end up looking ungainly, thus missing the point.
2)Cost. You can pick up a new close coupled pan and cistern for £60
3)Ease of installation.
4)Ease of access after installation.
All my 3 are close coupled which I did myself using flexible pan connectors and flexible hoses with isolation valves. Pretty straightforward.
If you still want a concealed one its just a bit more work and cost
Close coupled would be better for these reasons
1)Position. You will have to build some studwork to accomodate the cistern and frame, which itself could end up looking ungainly, thus missing the point.
2)Cost. You can pick up a new close coupled pan and cistern for £60
3)Ease of installation.
4)Ease of access after installation.
All my 3 are close coupled which I did myself using flexible pan connectors and flexible hoses with isolation valves. Pretty straightforward.
If you still want a concealed one its just a bit more work and cost