It would probably work better with a FET or newer high-gain bipolar. I get about 100 mV peak to peak ripple, most of which is due to the ESR of the capacitor, which must be about 0.05 ohms. Layout and construction methods are not critical. Design can easily be tinkered with to scale up or down, or adjust to your requirements. You can get any voltage or any group of voltages you need.
Parts are larger.
My transformer is about 1.5 x 1.5 x 2 inches. Caps are bigger too. Parts cost may be higher unless you have a good transformer on hand. Regulation is not as good. The core of the 12V inverter consists of Q1, T1, D2, and C3.