I, myself, am an avid GIMP user, and I think I might be able to adjust the PSD to work with GIMP easily.
Instead of using grouped layers, I plan to re-organise them into one solid xcf file where each and every element set is grouped together. In other words, all the layers with regards to Aether are put together, hence making it easier to navigate without the folders in PS.
Likewise, for this to work I need to know the text size and font. That would help tremendously. Thanks in advance!