No mod's on the two antec 1200 case's, just Two Rig's with the same part's in both. Antec did a really good job pre modding this case, great air flow, with the three fans in front with build in fan speed knobs & removable filters, the back two 120mm fans & top fan have a nice switch panel in the back, that control's low, medium, & high, with the option to turn off the top fan led's. Antec also provides you with a good amount of cutouts for wire management, & little tabs on the inside & back side of mobo tray, to mount zip ties. unless you want to change the look of this case or other extreme mods, they really did a great job, for any builder.