I did some emailing yesterday to see what I could find as far as prices go.. Here is one reply from a fabricator in Kalamazoo, MI.

I think I need to find someone doing this on a much smaller scale... larger companies see this as an inconvenience if anything.

We can certainly do this unit for you, however, I must warn you that a single item such as this is regarded as a "Prototype" and is cost prohibitive.
There may be something available on the market that you can purchase, and I can tell you that if there is, we cannot beat the price you can buy it for.

I encourage you to research this and see if you can find it. In the event you cannot, and "cost is no object", then please feel free to contact us for an actual quote, which we will be happy to do for you. As a baseline, our prototype costing starts at about $2,500, although with an item as simple as this, I think we could do it for about $1,500.
Here is a freebie: Despite the weight difference, I would go with 3/16" steel to fabricate this as aluminum is actually very delicate, and dents and scratches easily even in 1/4" thickness.