Thanks. I'm thinking about using one of the PSII kits I already have, like the Argent, and buying three 24mm kits such as the Super Neon. My thought is to use parts from the neons to make external booster-like pods, and I'd like to be able to air start them electronicly once the rocket is moving on the central motor. I'm thinking about housing the electronics in one of the booster pods, so if I use the Super Neon, that is 1.63" BT-60. I'd also like to be able to electronicly deploy the chute at apogee using an altimeter, in case the booster pods do not ignite. So ideally, whatever timer or other system I use would also include an altimeter for deploying the chute, in addition to being able to do the air start.