Computer servers and server rack parts (Rubery B45)

Hi

We are looking for computer servers and network items that normally go into a rack like the picture. These devices are wanted by me and my son to tinker with as a father son project so even non working item would be great. May he u have updated or have had to replace due to breakdown etc.

My son who will use some of the items for a sculpture he is working on.

Thank You in advance for anyone who can offer any devices