I've come up with a much more compact layout for the tower itself.
Each 6x6 layer contains 8 RedNet cables, 4 glass fiber cables, and 12 separate 1-chamber reactors.
This design doesn't leave any room for AE stuff though- but it works quite well using Factorization Routers to insert uranium cells and extract depleted cells. You'll need an item filter to prevent the second router from pulling the wrong stuff, which is a hassle to make, but two routers and a logic matrix PER TOWER are probably cheaper than all the AE components used by the OP. Even if you don't already have any Factorization infrastructure at all.
You'll have power loops if you do it that way. You don't want a square of four glass fibre cables anywhere in the design.
I don't trust routers to be able to handle this kind of situation. Every time I've tried, Bad Things started happening.