Ahhh, got past a fiddly time consuming bit, the hdd cage mount clamps & still managing to avoid adhesives completely except for the acrylic adhesive, all the metal work so far has been countersunk bolts & tapping , finished this bit at 11pm & was a rather chilly -5c .
What you are seeing is 4mm sheet, then 19mm square bar, hdd cages inbetween a slim 3mm pieces & another 3mm piece on top that overlaps the hdd cage base & meets up with the angle bar of the cage, it's such a good fit that I might leave the extra clamp I was going to make for the front & back of the cages as it takes a little force to make the cages slide out.
What you are seeing is 4mm sheet, then 19mm square bar, hdd cages inbetween a slim 3mm pieces & another 3mm piece on top that overlaps the hdd cage base & meets up with the angle bar of the cage, it's such a good fit that I might leave the extra clamp I was going to make for the front & back of the cages as it takes a little force to make the cages slide out.