I want to try new enclosure size

[davent]

I was hoping to provide actual data but I'd couldn't find anything in the data sheets either.  I can tell you for certain the 1550Bs I've purchased have noticeably thinner walls.

Thought to checked Digikey,  down as 2.01mm, they also have files there formatted for CAD programs and 2D (.DWG) files which you could get the thickness from. (cdn. prices) size again just chosen at random
https://www.digikey.ca/en/products/detail/hammond-manufacturing/1550G/2211540?utm_adgroup=Boxes&utm_source=google&utm_medium=cpc&utm_campaign=Shopping_Product_Boxes%2C%20Enclosures%2C%20Racks_NEW&utm_term=&productid=2211540&gclid=EAIaIQobChMI26L16OOb6gIVED2tBh1Fag6zEAYYASABEgLXUvD_BwE

The website has the 1590B as having 2.03mm wall thickness so just a wee bit thicker.

https://www.digikey.ca/en/products/detail/hammond-manufacturing/1590B/131015

... more.... checked  a 1550B @ Digikey... 1.5mm thickness, that's a good chunk thinner.

https://www.digikey.ca/en/products/detail/hammond-manufacturing/1550B/2211530
dave