bit 9, I must say, first of all, that I’m impressed by your de-soldering skills. You have been able to cleanly remove all the components without any solder falling here or there. This has been an excellent example of hard work.  The 80hours that you have spent on it have been worth it most probably and not only will this help me, this will also help so many other people who were waiting for someone who will do this. Anyways, thank you for your hard work.

pcb cost

That’s true you can re –flash the IC many times and it depends upon their cycle and it is close to thousands depends upon the IC and that is good idea to put the IC socket for the safety of IC. If you want to start with ATmega168 then start with the datasheet as it will provide you the complete description of the hardware and the firmware planning.

pcb fabrication

@DMGer, A resistor is put in series with the light so that it can limit the current going to the light. You can use any resistor between 30ohms to 100ohms because resistance isn’t the key here, it’s just there to limit the current being supplied to the LED. If you don’t put in the resistor, there can be so many different implications, burning the LED is one of the them and since there is no limit on the current being supplied to the LED, it can damage rest of the circuit  as well.

assembly pcb

What is the value of the crystal oscillator you are looking for? By the way here's a link of the supplier of crystal oscillator
http://www.foxonline.com/foxstandards.htm

turnkey pcb assembly