i found an interesting bug with the Reactor Chambers: when placing the reactor chambers like in the following, then each reactor has a 6*5 gird instead of 6*4.
They don't share the chambers, so its in total of 6*10 gird instead of 6*8 where you can access 2 chambers form both reactor. It can probably used to get additional outward cooling, but i haven't tested that. Also if there is more than 6 chambers in the 3*3*3 area around a reactor, the gui starts to glitch and if there is 8 or more some columns become inaccessible because you throw items out of the reactor instead of placing.
Using that glitch i made a power plant with 9 (probably) MK1-O reactors each producing 60EUs (total output 540 EUs) using only a 5*5*5 cube(7*7*7 if you count the containment chamber)
PS.English isn't my main language so i must apologize for any spelling (and other) errors