Dansol yea you can use a integra front lip (1994-2001)
http://www.mx6.com/forums/showthread.php?t=175644 (i'm going to buy a type-r lips) shows my 1998-2001 front lip in progess. if you do integra type-r front lip your going to have to cut and bondo. i heard the 240sx front lip is a direct bolt-on (no cutting or bonding needed) . about the sides, i dont know where you got wrx sides from but you can try using 1997 and up honda prelude mugen sides, your going to need to extand it by 2 inches. and the rear you can use the camero rear and all you have to do is cut where the exhuast of your car is. I never herd anyhting about the wrx side?