I have an extra pair of really nice chassis. I ordered multiples in planning to make numerous mono blocks for multiamping. Well plans change, and I don't think I'll use these. They are sitting on my storage shelf in the original wrapping still, unopened.
I sold off an extra pair before (quickly I might add) and now I am selling another pair. Here is a picture of one pair of the chassis that I used in my UcD400 monoblocks (which I am keeping).

The model number is ATI-737U. It looks like ATI's site is down or they went out of biz. Ordering from them was a PITA as you had to do a bank transfer to Thailand. So that might explain why the last pair went so fast. My asking is what I paid for them, no more, no less. $75/ea or $150/pr. I'd prefer to sell the pair, but will entertain sell just one too.
Details:
Dimensions (mm)
Front plate: 258 w (10.15") X 97 h (3.8") ( 6mm thickness )
Body size : 253 w (9.9") X 94 h (3.7") X 300. d (11.81") ( 1.2 mm thickness )
All aluminum anodized
The other option that I would be willing to consider is selling a package for building UcD400 mono's. I have 700va Antek toroids (beauties), Jensen 4 pole caps (or Elna Cerafines if you prefer), IXYS Bridges, Bulgin vandal switches and of course the UcD400 modules (I have the AD versions). I don't plan to sell off those components seperately, they will just get put to other uses, but I'd offer to sell them together in a package to someone looking to "one-stop-shop". I'd go one step further and be willing to drill and mount all switches and connectors to the chassis prior to shipping, using my drill press, to make it easier for the DIY'er with little tools.