I'm using a dna 250 chip, and lipo battery, my box is in work being custom fabricated at the moment, just buying my supplies and stuck with the shortage of 510 connector companies. I heard the plus and minuses of fat daddy and varitube, but i narrowed it down to 2 choices, but due to the lack of reviews being found and lack of specs on the other, I'm looking for real world experiences with the MODCRATE HCP and the AVID/CISCO 510 connectors, size is not an issue. My box specs are 7x3x3 inches.