I have an old 600amp MOT/variac project that I re-purposed for doing electroplating, but now I need to put all the 'junk' inside a metal carry case.
Are there any online places that have a large selection of something like this pic?

 

Have you tried Amazon?
They have quite the selection,
The plastic ones are a bit cheaper, What is the OA size?

 

Have a look at Hammond 1458 series enclosures.



https://www.jameco.com/shop/Keyword...search_type_c=jamecoall&freeText=hammond+1458

 

I looked at a-zon, didn't find much at all.
OA is something like 14L x 8W x 10H. Has to be all metal.
I need to mount the MOT, a hefty 200A rectifier that's on a large heatsink, two 63v 20,000mfd caps, and a 300A shunt inside. On the front panel will be two analog round gauges (0-10v and a 300A/75mv), a 1P6T rotary that provides x1-2-3-4-5-6 scale to the V meter, and two 35-50 DINSE ports. I am trying to build it completely passive, but I probably do need to add a cooling fan to the heatsink, this would also discharge the caps back down when not being used.

 

Digikey, Mouser, RS, Newark – any of these distributors represent all of the major vendors.

 

12 x 16 x 8 probally have to go to an electrical enclosure, Vevor have one at exactly those dimensions.

VEVOR Steel Electrical Box 16" x 12" x 8" Electrical Enclosure Box 304 Stainless Steel Electronic Equipment Enclosure Box IP65 Weatherproof Wall-Mounted Metal Electrical Enclosure with Mounting Plate

 

12 x 16 x 8 probally have to go to an electrical enclosure, Vevor have one at exactly those dimensions.

VEVOR Steel Electrical Box 16" x 12" x 8" Electrical Enclosure Box 304 Stainless Steel Electronic Equipment Enclosure Box IP65 Weatherproof Wall-Mounted Metal Electrical Enclosure with Mounting Plate

It costs a bit less than an unknown product, and you do get to know all of the details before ordering.

 

I looked at a-zon, didn't find much at all.
OA is something like 14L x 8W x 10H. Has to be all metal.
I need to mount the MOT, a hefty 200A rectifier that's on a large heatsink, two 63v 20,000mfd caps, and a 300A shunt inside. On the front panel will be two analog round gauges (0-10v and a 300A/75mv), a 1P6T rotary that provides x1-2-3-4-5-6 scale to the V meter, and two 35-50 DINSE ports. I am trying to build it completely passive, but I probably do need to add a cooling fan to the heatsink, this would also discharge the caps back down when not being used.

Is that inches? How about a 19" rack case?

 

Certainly a better price to quality ratio will be found at other distributors that provide detailed descriptions of their products for sale..
Way too much uncertainty about what you actually get at amazon, from the experience of a family member,, and seeing those ads shown in posts on this site.
Deal with an HONEST electrical parts supply house., which is willing to publish an accurate description of what they have to sell.
MAX mentioned one, there are a few others as well.
If the supply is going to be used near any electroplating process it needs to be in a vapor tight enclosure to avoid corrosion issues.
And if that is really a 600 AMP VARIAC, it is not portable without a fork-lift. A 600 WATT one, yes, "two hands" portable.