If you have contents insurance, check with your insurer that your diy effort is not going to be pulled out by a proper alarm co. to put it on redcare ect...
8 zone controls for a house with a remote keypad are a lot cheaper than just a remote keypad for proper controls....
if you want cheap buy a dummy box, if you want a dummy adt box from ebay you'll pay more than the 8 zone house controls with keypad