cyclegadget:
Here is a thread about making boards for the SMT 328.http://arduino.cc/forum/index.php/topic,69622.120.html
If you are going to the trouble, you might want to consider a 32u ..... The chip that is for the Leonardo that has not see the light yet, it has on board USB capability.
A long thread. A lot of talk about boards, but I didn't see anything specific on loading a bootloader on the TQFP.