Spyder power supply component ratings

[Vipul Nigam]

Hey guys,
Im new to Diystompboxes.com, and this is my first post,forgive me if I sound like a noob.
For my first proper diy build,I was looking in at building a spyder isolated power supply with 8 outputs. I have understood the basic schematic, but am confused with the ratings part of the component. FYI I'm not looking for any online links to parts or part numbers as I am directly sourcing my parts from a local electronic component supplier.
1) I am buying 8 230vac to 12vac transformers.
2) couldn't find db01, will any full wave rectifier do the job? And if yes, is 100v 1A rating suffice?
3) the capacitors in the original design a 220uf and 10uf, what should be the voltage rating of these capacitors?
4) and in the design schematics, I saw that the positive lead is connecting to the centre of the output DC plug, will it work with my boss pedals?
Reply asap!!