DIY PSU build query...

[Doddy]

Wiring secondaries in parallel is a perfectly acceptable solution - just remember you need to make sure the phase of each secondary is matched (you normally find one end of each secondary marked on any schematic with a 'dot' - wire dot-to-dots and non-dots-to-non-dots... if that makes sense). Don't worry, if you get it wrong your fuse will politely inform you.

The only issue to consider is that the power loss in a system rises as a square of the current drawn - you'll have less losses for a given wiring CSA if you can distribute your load across individual secondaries, rather than wiring everything to parallel secondaries. But, provided you over-spec the wiring, and/or avoid daisy-chains on the power distribution then you shouldn't have problems.