Best filler compound?

Hello all! I'm starting a new build in a 780T, and while he case is almost perfect for my needs, I'll still be doing a few mods. My biggest issue with the case is the I/O /fan controller area and the mess of wires associated with it. Instead of using what's supplied, I'll be using a Lamptron CF525 to control all fans and lighting. I'll be replacing the I/O area with a single vandal resistant power button and an XSPC temp monitor to monitor coolant temp. So back to my original question...



What would be the best method for filling that space in terms of a body filler? Any suggestions on brand/type?



I ultimately want something that will fill the holes, never crack, but also won't take tons of prep work...



Pictures of my current progress below:biggrin:







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