V2 is the original STL file I got from Thingiverse and opens fine/gets sliced without problems. Z Top Axis was the problematic one and was solved by redoing the whole component, making sure that there were no scaling or geometric errors. It ended up opening fine in OpenSCAD.

With the orientation issue, it seems as if Solidworks' front plane is used as OpenSCAD's ground plane which I find odd. I just rotated the part properly using OpenSCAD's graphic window as a guide.

Thanks for the help guys!