Hello Johnny and congrats on the case!
With 25mm fans up front, there is approximately 312mm worth of space for a GPU (personal measurement from back of case to direct contact with the fan shroud). Without case fans, 330mm is the max length of a GPU this case can support (according to official Sliger specs, likely leaving ~7mm to account for angled installation requirement at that point).
I think that if you slot in the gpu first and then slide the fans into position at the front of the case- it should work. If you run into any issues, there's nothing a little sandpaper can't do to lower the height of a fan or reduce the plastic GPU shroud itself.
If you skip the top-most intake fan, you could mount the 2.5"/3.5" drives comfortably at the cost of airflow behind the PSU over the VRMs.
With the inclusion of the swinging arm bracket, you cound mount a single 2.5"/3.5"drive to that as well -the Enermax cables are pretty forgiving.
However, if you can swing it -my best recommendation would be to stick to M.2s, or make use of an external Samsung T5 and keep the ventilation at optimal levels.
