Do not use resistors or capacitors across the diodes. You can destroy the whole works by doing so. Modern diodes have an avalanche region on the reverse side that acts like a zener diode connected across the reverse junction. It will start to conduct if there is any reverse current and that will equalize any reverse current in the whole string so that one diode does not see more than any other.
With resistors or capacitors, if they change in value at all that can force unequal currents thru some diodes and destroy them. See ARRL handbook power supply section.
Agreed: the "modern" way to do this is to use several diodes in a simple string, with a large allowance for PIV. 3x the calculated PIV is probably about right, but that isn't a hard limit - feel free to use even more diodes if you wish.
"Equalization" requires high-voltage, close-tolerance resistors and capacitors, and any failing in this area will make things worse
for the diodes. Well matched diodes are actually the cheapest solution today - so if in doubt, add more diodes.
As for matching, a continuous reel from a named manufacturer and a quality distributor will be good enough. Once again: if in doubt, add more diodes.
We can also delete the word "modern", because the ARRL Handbook
updated this point about 20 years ago. Any
rectifier diode that we would use today in a power supply is an avalanche type that does not need "equalization". (I checked that specific point with the original Handbook
author. Even way back then, it was already true.)
73 from Ian GM3SEK