I've aligned t1 and t2 from CSI1 BOLD5000.
The t1 seems to align well, but not t2.

It's using t2 version of the template, so I am not sure what's going wrong.
+ flirt -interp spline -in input_robustfov.nii.gz -ref templates/MNI152_T2_1mm -omat roi2std.mat -out acpc_mni.nii.gz