After reading almost all the posts (took me about 12 hours) decided to build my own cintiq. Its called Waco.
I found an intuos 4 xl on ebay for 359 Euro (delivery included) It arrived last friday and it is in mint condition. I checked it already and it works flawless and it looks brand-new.
Next step is the display. The display will be a little bigger then the tablet. I think this will decrease the chance for possible jitter, because most electronic parts of the screen will be outside or further away from the tablet, and of course this will give me the biggest possible drawing surface. Also you can use the rest of the screen to park some of your tool panels. To activate them i will use a touchscreen.
Well... That's the idea...
I measured the maximum distance between my tablet and the pen and this is roughly 13 mm. I will probably win another 2 or 3 mm by dismantling the tablet. So i get roughly 15 mm distance between the tablet and the pen.
I found already two displays which looks promising:
LM230WF3-SLB1 This display is used in the AOC i2353fh. Its an 23 inch 1920x1080 e-ips display that sells for roughly 160 Euro. It has al its electronics in the stand, which makes it easy for having al the electronics far away from the tablet. http://www.datadisplay-group.com/fileadmin/pdf/produkte/Displays/LG/LM230WF3-SLB1_Datasheet.pdf
I found an matching capacitive touchscreen but have still no prices.
This panel is about 6,5 mm thick and the touchscreen us about 3mm. Together less than 10mm thick.
All the tech specs you will find in the link below:http://www.datadisplay-group.com/message/detail/a-fashionable-teambrlg-display-23-tft-inotouch-touch-screen/
Another contender is the LM240WU8–SLA2. It is used for instance in the following three monitors;Dell U2412m, HP ZR2440w and the Asus PA248Q. This is also an e-ips panel. but this is 24 inch 1920x1200 and 8bit.http://www.msc-ge.com/download/displays/dabla_allg/lm240wu8-sla2.pdf
I found also a matching touchscreen.
This screen is about 10 mm thick and the touchscreen is also about 3mm thick. This is getting close to the maximum, but i expect i can win another mm in the panel by removing the metal back panel.http://www.review-displays.co.uk/acatalog/Silver_Patterning_PCAP.html
Below on the page is the link to the display panel.
A great screen would be the new display used in the new 27inch iMac. it boosts a grand 2560x1440 pixels, is s-ips and should also be around 7mm thick. But i can't find any technical data about this new screen. Anyone?
The idea is that you use the pen for accurate drawing in a certain dedicated space of the display, and control the rest with the touchscreen. A capacitive touchscreen only works with your hands and not with pens or other hard or non conductive material. It is also multitouch. The only thing i have to check is what to do with the hand which hold the pen. (palm rejection or wearing a wacom glove)
So, That's the concept in short.
The tablet i have already
next thing, decide which monitor to buy.
When anybody has any suggestions or know anything about this display panels, touch screens, etc... feel free to reply