There's so many ways to install electronics that it comes down to what works for you. This is where the research and even some headaches set in but it really does help to have things at hand to visualize the space. You could even put the board in the the ribbed grip section if you want, and then the 4" section could hold your batteries. The only problem is that makes SD card access more difficult since you'll need room to counter twist wires before assembling the MHS parts. Every solution has it's benefits, limitations, and sometimes solutions. Unless you repeat hilt design aspects every build presents new challenges.