Your description sounds as though you are 're-inventing the wheel'.
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If I was me, I would scour wrecking-yards (aka 'vehicle dismantlers') for a complete box of about the size you need.
As one example:
* Anderson Brothers Heavy-Truck Dismantlers in Eugene Oregon
They have a rapid turn-over of all kinds of trucks -- dry-van, semi, tankers, trailers.
Take-off boxes can be re-used on another truck, or re-purposed as on-ground stationary storage.
The adventurous, seeing opportunity, re-purpose them as TinyHomesOffWheels.
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2003, we converted a 1997 Ford CF8000 commercial truck to our concept of an ExpeditionVehicle.
It came with a yuge 24' box, 8.5' wide and nearly thirteen feet tall.
With a couple forklifts, we sold that to a farmer for a chicken coop.
From Mid-Lane truck repair shop, we acquired a take-off twelve-foot box -- us$350 installed.
12 x 7.5 wide x about seven foot tall, a lot easier to manoeuvre.
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One advantage to a small box/small vehicle/small quarters:
* less space for less stuff
In other words, 'take up harmonica, quit them tuba lessons'.
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One of my favorite hobbies is walking wrecking-yards.
Visually de-constructing various vehicles always gives me ideas... and the visceral physical experience works better for me compared to two-dimensional on a computer screen.
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As I understand you, your structure will be a one-off, completely custom.
If I was me, I would discuss this with experienced fabricators, welders and fitters with years of fussing with custom stuff.
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If I was me, I would avoid listening to new welders, youngsters lacking the experience to predict potential failure points.
For such a project, experience trumps enthusiasm.
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