Custom Loop in the Carbide 175r RGB

I'm going to be upgrading to custom water cooling from air soon, and really don't want to have to buy a new case. I'm currently using the Corsair Carbide 175r, I know I can fit a 240 rad on top, but with my gpu length I can't fit a 280 in the front unless I put it in-between the front panel, technically on the outside of the case but still covered by the front panel, I'm concerned about the airflow with that option unless I modify the front panel extensively. My other option is to mount the 240 on top, and then hopefully a 120 on the rear, but I'm not sure both of those will fit, does anyone else have this issue or know if this radiator combo will work?