Hm, there are some problems with that technique::
- 100 power capacitors in one group give more total power than two groups of 50
- With the same reasoning you are limited to small reactor cubes (if you do not have lines connecting across block boundaries, e.g. sticking out). Even when only using small modular reactors, you can get more than 9k e/sec out of a 5x5x5 space, so there is some room for tuning
- You need different versions of interior filling/ exterior blocks, e.g. pure system block 9x9x9 cubes without hull for the interior filling (or do you already have them?) and specialized hallway/connection/room blocks for the actually walkable interior, or you end up with alot of surplus mass and hull cost.
To make your reactor modules very efficient, make sure that when placed next to each other the boxdims amplify so that you get more than twice the power for two generators next to each other. Let both the power regen and the capacitor groups touch (capacitors all in one group as usual), and you win alot of extra numbers