so, to get this all in one line,
the general idea:
an nuclear reactor, no energy production
an uranium cell - only for its heat
an few coolant cells - propulsion?
an few iridium plates - radiation protection - heat?
good plan, and when u fly above the height limit of ur world, it would slowly start to kill you with radiation (just like the void does with falling for to long)
nice, i cant wait for my nuclear powered jetpack to burst me off into space
btw, would its speed of lift of be changed? since it is nuclear based it should have an high flight speed