I took my rosewood sides down to 2.2mm. The back to around 2.4mm. After final sanding they wound up at 2 and 2.2.
I've found for the first few builds the bracing tends to be a bit too much and over braced, timidness creeps in of possibly shaving too much on them. 3mm is a good safe start, but also ok to go down to 2.9 or even 2.8. The stiff bracing will compensate for the thinner top and should come out with a nice marriage between the two.
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2013 Jared Booth OM - eurospruce/mahogany
2014 Jared Booth 00 - europspruce/rosewood
2015 Jared Booth 00 - sitka/mahogany
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