That picture online is a red herring i think. It doesnt match the pics form the dj manual.
I found more info and have the spec for the machine now. Its a different machine spec to what raw thrills use for the regular driving games etc. I guess they didn't need as much horsepower. the machine is a desktop type slim case one.
You can see the back of the computer in this pic from the manual. This helped me work out the type of graphics card in use. Its not using the onboard video from the motherboard still. Weird way to mount the computer in the case with straps. I was expecting a more industrial type case for the computer like with namco n2 systems etc
Parts to build the computer should be arriving shortly.
My next hurdle is what to do about a missing dongle

machine arrives tomorrow so ill be searching high and low in the cab in case its still there somewhere but if not what to do??? Any thoughts... Do we think its impossible to recreate one of these usb HASP things, or is it just storing a serial key in there that is read at boot ? The actual usb keys themselves dont seem too hard to buy. But if there is no chance at working out what it wants on there then i guess i have to find one from a spare machine.
MAME support is started but i am not sure at this point if it runs or what they do about the dongle issue