Long-term plans?
I expect that IMAGINE will continue to be used in the future.
Is the goal to adjust it to NIFTy 4 or to stick to NIFTy 3? I can help with the migration if necessary.
In the current state the package is not installable, since setup.py tries to clone the "master" branch of NIFTy, which does not exist.
To upload designs, you'll need to enable LFS. More information