Wow, very nice, well done! I\'ll have to read this a couple of times, I\'m not sure where the T shaped bit could go, but it looks as if we\'ve started it from the centre a bit differently too. I notice you have left a 1 block gap between the two interlocking 3D Ls at the centre? In my one they are actually touching, so effectively there\'s a centre 2x2x2 block which doesn\'t feel all that great (perhaps this can be improved upon), but it means instead of the 3D Ls only reaching 3 of the sides, it\'s turned into a large cross which reaches all 6 sides. I was a bit unsure about this at first, but I tried it with a different reactor challenge and it worked really well. It\'s better suited to reactor blocks of even dimensions though, like 22x22x22 or 24x24x24, so I had to shave a few edges off mine to meet the requirements of the challenge.
I think this is the difference where you were able to use T shapes, and I used (I\'m gonna call them) chopsticks. I\'m assuming that 1 block gap makes those T shapes fit in really well.
Good job!
Looking forward to seeing some of those compound reactors too. Sounds like that could be a load of fun too, but a huuuuge time sink considering the size of the ship needed to go with it.