Thanks sallybeth23!
I have a hard time sourcing materials for raised beds, I'm forced to reuse/repurpose containers as of the moment. I pre-planned my planting so I don't overharvest as I only live alone, but I might share this to my neighbors if I have too many.
Didn't know soil can be priceyyy, it's just free like almost everywhere! I might go with composting with some veg scraps so I could add a bit to the soil.
This would be a great achievement, will look forward in the next month for the red bok choi ;)