Seating Area on Retaining Wall

[Cham1]

Hi 

I have a retaining wall in my backyard 600mm high and 400mm from the fence to the retaining wall . I am planning to do a seating area on the retaining wall , attaching a timber frame (TIMBER FRAME LIKE  " ] ") to the back fence and fill it with soil and install the pavers by using the liquid nail to the timber frame  . But I'm not sure whether its suitable or not in this situation.  Can anyone please help me with this ?
Thanks