I didn’t have this problem with the Tsunami Dream since its metal brackets are held with screws. I simply put the optical drive into a lower bay. After the optical drives are in, you can close the front panel as you won’t need it more.
It is quite easy to install hard disk drives into the Soprano: you just insert the drive into the rack and fix it with a plastic lock whose pegs fit into the screw-holes in the side of the device.
Other 3.5” devices are fastened in the same way. This is overall a convenient solution and the only trouble is that the rack cannot be removed and you’ll probably have to take out your expansion cards to extract a hard drive from the assembled system.
The Tsunami Dream’s cages for hard and floppy drives are removable and are secured with one screw:
After undoing this screw, you can take the cage out:
And load your drives into it: