I dunno if this works with 1.1.3, but today I succeeded on modding my keypad dialer on my 1.1.2 otb phone.
Try exporting the MobilePhonePackedImages.artwork file with iphoneshop-0.4 and playing with the pngs in photoshop... Thats what i did and works great.
this is what mine looks like (see attachments...
if you need more specific details... read this thread
http://modmyi.com/wiki/index.php/Edi...k_files#Step_1
but just replace the keyboard artwork file with de dialer one...
or else just sned me a message id be glade to help...