Forget standard Velcro. I use this stuff:

[Link: tinyurl.com]

Cut to length is the way to go.

Hat tipped to you Simon..very good job.

if you need me to give the stamp of approval its a sad
day for sure.

Simon,

Looks real good, especially if you've figured out on your
own.

The only recommendation is to purchase a label maker designed
to make labels for wire, such as a Brady IDExpert or a
Rhino Pro. It's an investment, but the the product will
pay for itself within the first large rack.

Also, I'm not on the anti-wire tie train, because velcro
has it's benefits and drawbacks. In larger racks such
as the one you displayed, I would still use wire ties.
Also, you should have a nice pair of flush cutters so
as to cut the excess off the wire tie flush with the head,
thereby not creating all the pointy razor blades at the
end of the wire.

The reality is that any experienced pro should have both
velcro and wire ties, and use them depending on the situation.

Nice job Simon.