Regarding needed space for big capacitors on the PCB it could be beneficial, to use a 'capacitance multiplier' (I don't like this label, because it doesn't multiply any capacitances, but this the name, especially in the english spoken community) like the one inside the design shown in post #48.
With that the capacitors don't have to deliver any big current, because the current is is supplied by the emitter follower bypassing the capacitances. The input voltage of the voltage controller is now very smooth, resp. ripple and noise suppressed are very good, just like you would have used very big capacitors.