Nice with reusing old flooring, here it typically is throw away as it will be riddled with borer, which would be the only reason to replace it. You have to have a certificate that the borer is eradicated before you are allowed to take it to the dump, so often it is cut up and burnt on site instead. There is a market for used flooring in good condition, used to repair existing ones. My floor is parquet but because of the borer damage it has been filled and covered with carpet and vinyl. Too expensive to rip out, as it is stuck down with bitumen, and too much to replace piece wise to get it looking good again.
BTW nice bricklaying, that is hard work to do. I was "volunteered" to do an acre or so of that during training, using reject brick loads from a brick factory. Never had to cut a brick, you could always find an odd shape to fill the hole. Underlay was brick dust.