I needed a small, light and modular shelve structure to store my network equipment. I had previously made use of RostaP's honey comb storage wall (in a different context) and though it would be excellent for this purpose. It ended up working very well.

In addition to the models here, you will need  hollow fasteners (both single and dual) which are available on the honey comb storage wall project's page.

Few additional notes:

• Each shelve in my setup makes use of two honeycomb bases attached using dual hollow fasteners. 
• Using two honeycomb bases for each shelf allows for a total usable internal surface of 31cm x 20cm.
• All the pieces attach to the honeycomb base using hollow fasteners.
• All the nuts and screws used for attachment are M3 sized.
• The PoE injector support was based off TP-Link's injectors for the TL-WA1201 and TL-WA801ND wireless access points. Both devices use similarly sized injectors. The support might be compatible with other APs from TP-link but I haven't checked that.
• The “DIY patch panel” uses “BENFEI RJ45 couplers” which I got off Amazon.