Doesn't seem that complicated. Couple of 4x8 pieces of nice wood, run them through a planer to get them flat, and a couple of passes on a jointer to get the face profile ready for the cushion. I'd probably get it close and let it rest before the last couple of passes so the wood stabilizes. Nice wood is expensive, you might be better off getting some nice plywood and laminating that to build up thickness. If I went that route, I'd consider putting T-nuts in them as I built it up,
What exactly does your work do? There has to be someone there that can do this. They would also be familiar with the capabilities and could think of a better, easier way. Do you just need a cross section of the rail? That's easy enough. Then you can cut it to length. Do you have the bolt holes dimensioned? I think the base may be more difficult because I feel like there is a subtlety to levelling a table that I am unaware of and a good or bad design will make or break the table.