i am thinking about attaching the coupler to my acd mini display port then at the other side using a mini display port to VGA or hdmi
That won't work.
The mdp-to-VGA adapter you show converts a MDP output to a VGA
output - it won't convert your PCs VGA output to MDP. Same goes for the cheap HDMI adapters you might find (note that there are a lot of poorly described products and nonsense internet posts out there about this).
There are more expensive HDMI-to-DisplayPort adapters - e.g.
http://uk.startech.com/AV/Converters/Video/Active-HDMI-or-DVI-to-DisplayPort-Converter~HDMI2DP
... but note that one has a max resolution of 1920x1200, so it certainly won't drive the 2560x1440p Cinema display at full resolution (and might not work at all).
Take a closer look at your ACD. They don't have a Mini Display Port connector.
The Apple 27" LED Cinema Display (NOT the Thunderbolt Display, but the identical-looking older model)
does have a Mini Display Port connector - although it is a plug on a captive lead, not a socket on the monitor.
It
might work on a PC with a mini-displayPort output (not unknown) - but the ACD was only ever designed to connect to Macs so I wouldn't bank on it. Kaven's PC doesn't have one, so that's irrelevant.
