While Wietse knew he was in control, that the augmentation was now part of him, that the using the quantum trinities, the M-Brane grid was now like part of his own body, it still felt foreign.

I think - - - that by using - - - fits a little bit better.

D5, Wietse remembered and looked back to the floor plan that was divided up into a grid. In cell D4 there was a large room with the inscription 'Hubble Zaal'.

I think you should change D4 to D5 since you also said above that "Hubble Telescope D5"