When in doubt, build it stout. Diodes, capacitors and resistors are cheap. Make it three times bigger than you need.
Hahaha! Well, if I’m willing to wait a few days (and find something else(s) to get up to free shipping), I just found:
I’ll never need to buy silicon diodes in this power range again!
I’m looking at voltage regulators and / or constant current sources for some automotive projects, so, getting up to the free shipping may not be too tough.
I’m still curious what the general engineering rule of thumb is...