Made this last year and have been meaning to post pics for ages. It's 1350mm wide and 4.2m long with two 1.2m extensions for a whopping 6.6m total length.
It's all American Oak with the dark border in Cambia (heat treated American White Ash). The parquetry is about 6mm thick, laid on 18mm MDF using Techniglue, the moulded border is 60mm thick.
The extension 'trays' are 50x50x2mm box section steel, clad in black Ultra-high-molecular-weight polyethylene (almost at slippery as Teflon) running in 75x75x2mm box section steel rails that go the length of the table.
It was made on consignment for another furniture company that we do a lot of work for. They paid $12k for the raw table, final cost to the customer after polishing and delivery was around $25k.