GeeJee wrote:Question is: how to attach that PC screen onto it??

Special bracket,The music shop where i go have one on display on the roland stand With a V synth and 19" Monitor (looks cool) I had a look at it and it just a special plate that fits into the Ultimate stand groove with a clamp and then screws into the back of the Monitor similar to the wall mounted brackets you get for LCD TV/Monitor...
Those stands arent cheap neither .....Around £130 For the Two tier AX48s,theres also a cheaper model the black one DX48 which is now being discontinued
@Equinoxe5 you can buy them at most retailers on special order....I've been looking at getting one as i quite like them,Its just there a tad expensive for what you get....Sound control had a sale recently and they had a few in there listings,but they all got sold quickly!!!

due to the rockbottom price...
Given your engineering background I'm sure it wouldnt be too hard to knock out a metal Bracket to suit....I made a bracket to hold my dual monitors...
I'm gonna send an Email to Roland and ask them where they obtained the Bracket for the display in sound control....
Theres also the Kand M Spider model.....
http://www.multima.no/upload/images/150 ... Spider.jpg
Given the choice i prefer the Apex stands as there both about the same price,but the Ultimate stands look better...