Got the drive cage out, cut and riveted back, just enough space to have two hdd's and a hcore underneath. But, as always, somethin must go wrong and I ruined my only hcore while drilling the holes for barbs. Went to scrap yard, got two more hcores, same car, same model, but...this one is about 1" bigger (not that I'm complaining, more cooling surface). That bigger hcore indicated that I need to make another shroud to fit on it...
Here goes a nice way to attach the shroud on a hcore without goin' through the mesh: used two pci slot case covers, bent them, drilled and tapped for M4 bolt, some rubber and voila...holds the shroud nice and tight.