I painted the frames, made a template for the chair covers, covered the backs and cut out and overlocked the edges of the seat covers, then some time passed. Finally a few weeks ago my dad helped me finish off the project using my new electric staple gun.
Here's the result. Normally round the table in the conservatory, but can be stacked when not needed or alternatively used when the dining table is fully extended.
I'm fairly happy with them and they will get a few more years of use.