Anyway, the price was right and I decided to take a punt. I ordered the chassis over the weekend, and it arrived from Thailand to Arkansas today, and it looks pretty damned good.
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Dimensions are as stated on his site - 19 1/4" W x 2 1/2" H x 9" D. The 9" depth is the one non-standard feature compared to other available chassis, aren't most of them 8"?
Differences from the Natchakom chassis, other than the dimensions - there is enough room on the side flanges for mounting holes, the rear panel has holes for mini-toggle switches instead of Stackpole slide switches, and it's punched for a DIN footswitch jack instead of XLR.
The cutout for the power transformer fits a standard Fender Twin part, but the mounting holes are a little small and need to be reamed out a touch.
At any rate, I just thought you guys would like to know about another chassis source if you didn't already. I was afraid it might be a scam, but I did receive a real product, quickly. I'm just one data point though.