Angled Foregrip with Battery Compartment

After I bought an H&K 416C, I didn't want to use the included PEQ box, and I wanted to have an angled foregrip. I designed this foregrip to have a small compartment for a 11.1V LiPo stick battery.
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## Version 1 ##
was far too large, it's handstop was too small, and the holes for zip ties were poorly designed. Additionally, the grip was acceptable, but it was still a little slippery.
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![Version 1][v1-1]
![Version 1][v1-2]
![Version 1][v1-3]

## Version 2 ##
is a step in the right direction, but it still isn't perfect. It's profile is much cleaner, the holes for retaining zip ties are perfect, the handstop is beefy, and the recesses and texturing on the sides make the foregrip easy to hold. However, I'm not completely satisfied.
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![Version 2][v2-1]
![Version 2][v2-2]

## Version 3 ##
Version 3 is currently a work in progress. The design is modeled, and the stl files are uploaded, but I haven't had the chance to print them myself. Here's a brief summary o