How would you go about attempting to build this?

I am not sure if a rendered finish would be tough enough to survive the knocks and wear of what is essentially furniture, you would definitely need reinforcement on the front edges of the seats.
And forming up those curves for a concrete pour would take some skill.

Maybe rendered blockwork for the base and then hardwood seat rails on top to protect the render and then you could do a matching hardwood table top so that you don't have to cast a concrete table top. And this would give a nice contrast in colour, a bit of pop to what I see as a very bland grey setting.

Thanks heaps for the reply.

Sorry I should have mentioned I'm more trying to make the planter and bench not the table/ furniture.

Anyone who is interested the table etc made by blendconcretedesign.

Originally Posted by mrbudget

Sorry I should have mentioned I'm more trying to make the planter and bench not the table/ furniture.

Rendered block work is how I'd attempt it a s a DIY otherwise formwork and concrete pour.

Would rendered Hebel blocks be a good alternative?
I ask because they can be shaped with hand tools so you could easily do the curves.
I’ve never used them so don’t know how they would stand up to wear, water etc?

I’d form it up, easier I think with that complexity. Then render over it. Blocks are ok too but more work if everything is curved.

The cylinder shapes could be Hume concrete pipe.

Bite the bullet and form it up and pour concrete would be my advice. You could try to be clever with other options but in the long run you’re likely to wish you did it right from the start.