That's alright. Just worried when you put something that someone will take it as gospel with the little things like fittings and tubing. I just don't want to spend an hour working out the loop at this stage.
In regards to the 750D then no you wouldn't fit that but it would fit 1 x 240 rad & 1 x 360 rad. Use the 240 rad for CPU and 360 rad for the GPU's would still be better than the stock rad's for the GPU's.
You could though just go back to the Corsair Carbide 540 anyways as that fits the same as the 750D but would allow a cleaner look and better airflow.
In regards to the 750D then no you wouldn't fit that but it would fit 1 x 240 rad & 1 x 360 rad. Use the 240 rad for CPU and 360 rad for the GPU's would still be better than the stock rad's for the GPU's.
You could though just go back to the Corsair Carbide 540 anyways as that fits the same as the 750D but would allow a cleaner look and better airflow.