I was able to find a color matched mount for a top case on Ebay and picked it up for a reasonable price.
I could have drilled holes in the original part and made something work, but I was happy to find the original Vectrix parts.
The kit contained the paint matched tail cover and sub mount for a hard case, including brackets, spacers bolts to do the job.
It fit well and looked very clean when complete, better than I could have fabricated in a reasonable time frame.
I had purchased a aftermarket hard case from an ebay vendor that is removable with the flip af a key.
Quality seems fair to good, I do like that I can remove and take the box with me or use the mount as a rack to strap an item down.
While not the most stylish, I will find the space useful I am sure.