A word of warning here: wiring secondaries in parallel might cause a high(ish) idle current if the windings aren't identical (which they never are for 100%). If one has a higher voltage than the other, a current is going to flow when they're put in parallel which will heat up the transformer and waste power. Toroids seem the most suitable for wiring in parallel because of their construction technique (bifilar winding).
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I got caught out with that on a SMPS.
I used multiple thinner wires to reduce skin effect.
But I didnt have all the wires exactly the same length.
The transformer pulled much more current than it should have.
Took a while to figure it out.
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