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-Dcom.eteks.sweethome3d.resolutionScale=2.5
-Dswing.defaultlaf=javax.swing.plaf.metal.MetalLookAndFeel 
-Dswing.plaf.metal.controlFont=Dialog-11 
-Dswing.plaf.metal.userFont=SansSerif-11 
-Dswing.plaf.metal.systemFont=SansSerif-11

That works beautifully! I had set -Dcom.eteks.sweethome3d.resolutionScale=2, but some fonts were huge. I have now set the other parameters as suggested (keeping resolutionScale=2 though), and everything looks great.