About 6 months ago (laughingly called summer here in the UK) my aunty wanted a deck to replace a patio that had been destroyed during some building work they had had done.
Here's how I did it!
Step 1: On the Slippery Slop to Nowhere
The amount of in-fill you'd need to level this area would be tons.
You can see the slope by following the line of bricks along.
Most sensible way to create a level seating area is a raised deck.