> So I have an A-100G3 subrack inside a 6u road case and I want to
> add another 3u of modules. I'm either going to make my own setup
> or possible get a Tiptop Happy Ending kit. The Tiptop setup has a
> 110v wallwart to plug into the wall, which I hate. Is there any
> way to tap power directly from the Doepfer A-100G3 busboard/power supply

The A-100PSU2 has sufficient power for 2-3 bus boards (depending on the
total current of all modules connected to the PSU2 which has 1200 mA
available).
You may order additional A-100 bus boards as spare parts and connect them
with the enclosed cables to the PSU of the A-100G3. Details are available on
our website:

www.doepfer.com > FAQ > A-100 > Wiring the mains inlet, the power supply
board and the bus boards

I'd strictly advise against carrying out this modification yourself if you
are not familiar with electronics. In this case please consult an expert.

Best wishes
Dieter Doepfer