The answer to your question is no.
The NZXT Lexa S case is only 7.72 inches (196 mm) wide. That is not wide enough for a 160mm tall cpu heatsink such as the Thermalright Ultra 120. You will need a case that is at least 8 inches (204 mm) wide to accomodate a large heatsink.
I have a side window so that will give some extra space and i'm fine if it touches the side window...i have read good reviews about TRUE so really keen on taking that