Why are amplifier transformers sized the way they

Running a very large transformer reduces the potential for distortion, provides a lower impedance path for the AC, can deliver more current as needed in a more timely basis i.e. improved transient response under load, etc... There are no drawbacks to using a larger transformer than what you need other than the added cost and weight involved.

On the other hand, using too small of a transformer can result in reduced power potential, increased distortion, poorer transient response under heavy load, etc...

There was an old saying pertaining to amplifiers. That is, the heavier the amp, the better it was built. In many cases, this is the truth. Then again, one can skimp on a transformer and heatsinking and use double wall thickness chassis parts and achieve equal or greater mass. If you took the fancy "sculptured" faceplate off of some amps, it would cut their weight down quite measurably. Sean
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I am not familiar with all of the various laws or codes across the country, let alone in other parts of the world. I would look for robust construction using heavy gauge metals, good conductivity and plenty of slots for potential upgrades / added breakers. Other than that, you'll really need to discuss the specifics with an electrician or someone in your area that is familiar with local codes. So long as you can make and maintain a solid connection with low series resistance and adequate current potential, you should be okay. Sean
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