serena largo elgrand rear seats

[paddyponchero]

MY wife has lower back problems which means she can't really ride on the rock n roll for long periods.
I was wondering has anyone looked at using the nissan seat as these fold quite flat.
I can't find any measurements for the seats online and the nearest scrappy that has one is about an hour away.

I'm happy to do some welding and carry a mattress topper or similar for the seats.
If anyone could shed some light on this it would be great.