You already have a pattern in the form of the old fabric. Remove it carefully, place it over the new fabric, and cut out your new sun chair creation. Staple the new fabric in place and rest pretty!
It isn’t particularly difficult to make a hotbed and most gardens have a little plot in the south of their yard. Homegrown strawberries are the best!
Timber, staples, nails and and electric staple gun are all you need to make a flowerbox of wood. Fill it with soil and add plants. Gorgeous!