DC-DC converter

After a visit from Johnny SM7UCZ and some exchanges and after santa brought some components (IC,FET and Zeners) I am going to build one of his DC-DC converters for /P valve trips.

My version of the PCB is here

Note I have used TO220 with mounting holes but I'll not etch them or drill them and will solder the tab to the boards.

His original (in Swedish is here)
http://www.sm7ucz.se/DC_DC_converter/DC_DC_Converter.htm

I will use plastic D cell holders and a 30VA transformer I bought from Farnell and I have a big 470uF 450V electrolytic already.

The meters I will use are from John G8BTU