The holes on all through hole parts have been made bigger to account for slanted legs and bevels on the solder joints on the original board (so it sits relatively flushish to make soldering easier). Also added is optional zero crossing detection.

Once you are happy with the design, the best way to check for the fit is to print it out, cut any routed sections out and place it over the top:

Make any small adjustments to the measurements until it fits square on. Then it's off the to board house for manufacture!