AIRTIGHT:
head: Speed Metal (Serpentor)
torso: sorry...i forgot but any torso painted yellow will do
arms: Blowtorch
legs: Barbecue
helmet: Wetsuit mask + ROC Shipwreck hose + Luke Skywalker x-wing pilot helmet
vest: modded pit commando flak vest + x-wing pilot chest piece + PP Baroness nanomite
control panel thingee
gear: original airtight figure
Airtight was another one of my favorites but I wanted to add more personality to my custom.
His extra "bulk" was intentional cuz I wanted to emphasize the fact that he is a hostile environment specialist, thus the need for added protection.
I got the idea for the hoses from someone else's custom, again I think it adds to the personality of the equipment. And finally I was lucky that the original pack actually fit well as-is, i just had to shave down the peg a bit but it worked!