Having been through this process with "some pieces of sheet metal" and "a design" $200k sounds reasonable if you want something produced to an actual specification. It costs a lot of money to pay "a guy in a metal shop" to build tooling to reproduce a design to a specification. I could probably get it done for a 5-figure NRE in certain quantities but the per-unit price goes up as the NRE goes down.

You should probably consider that these cans have to be tested to some minimal standard to make sure parts don't shear off under the stresses they encounter during their service life. These stresses are probably more significant for parts inside of a military aircraft, as it may be required to take evasive action or perform higher-stress maneuvers even though this is basically a 707 fitted with expensive electronics. It sounds dumb in isolation because it's a trash can, but if you want predictability and low failure rates you really do have to test everything.

I personally lack the imagination to consider all the failure modes of the can but that lack of imagination doesn't mean that the failure modes aren't real risks.