Sadly, I've not had much to say as we await others to do the certification requirements but at least I have a prototype to play with now and the factory has built the parts for the build to commence as soon as the bureaucratic bit is done.
The side circuit board and the front panel work together to give the beep so both will be needed. The transformer and other parts are the same.
Currently the 1600AB beeps for the first 5 seconds of the 30 second unattended countdown, I think there is a chance that will change to the whole 30 seconds in the production model. This long winded and expensive re-certification is one of the reasons the previous model couldn't have a "beeper added" but now it's happening anyway, Mr Behm added it to the features.
We are expecting to land "Behmor 1600AB upgrade kits" with the roaster build so people can add the black front panel and new side circuit-board to their previous model roasters. Cost is unknown but hoping under $100 for both delivered within AU.