Your definition of powdercoat is too broad. Its generally accepted that
powdercoat in the powdercoat community refers to a plastic like powder
that transforms into a solidly linked coat at temps between ~300-400F
(the coatings generally start flowing out at about 300F, but need to
cure at about 400). Urethanes and ceremic coatings are not considered
powdercoating.
Doing powdercoating at home is quite doable, but you need to but a
powdercoating gun and colors. You also need an electric oven you won't
be using for food. You can get these and read forums on powdercoating at
eastwoodco.com.
Powdercoating isn't just for looks. Like paint, it protects surfaces,
but as has been mentioned, its heavier than paint. Its stronger than
paint though.

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Whoa. 'Powder-coating' is a generic term that applies to everything
from ceramic frits to vinyl. The temperature/atmosphere needed to
cause the powder to melt and flow together can be anything from 150
degrees to over a thousand degrees.

Key point here is that all 'powder coating' is not the same. Some
shops use but a single type of coating, say a urethane. Others may
offer a variety of coatings, from low-temp vinyls to chemically inert
epoxies.

You CAN do it at home -- it is easier than applying ceramic thermal
barrier coatings. But you have to know what you're doing. Most of
the information (and mis-information) commonly available has to do
with vehicular applications done mostly for the sake of appearance,
most of which have no place anywhere on an airplane. But it's the
cat's pajamas for things like a battery box, cabin fixtures and the
like.

-R.S.Hoover