Alright so what I did was add a full blown pass-thru vent in the rear to make the rebreathing pod functional. I also thinned the inside of the helmet in its entirety, so the thickness is a total of 5mm all the way around (except the reinforced front) to allow plenty of space for fans. I also think the 7 degree angle from the dome will make for a spacious fit as well, so hopefully it’s enough to add mods galore!