Expanding In/Out Reports on Keil USB HID example code

I'm implementing an HID class device and have based my program on the HID USB program supplied by Keil. I'm new to USB but am a fairly experienced programmer otherwise.

I have got a basic program working fine bit with single byte input and output reports. I've tested the functionality using a client called SimpleHIDWrite.exe

I need to expand both in and out reports to 8 bytes each to communicate with the host. Has anybody successfully modified this example program or does anyone have any advice on how to do it properly?

My guess is that I need to edit the report descriptor and also set up the inreport and outreport as arrays. Is there anything I need to watch out for?

My target is the LPC2141.

Any advice or information would be much appreciated!

Thanks,
Gareth.