I will start by stating that im not skinnyboy.
After spend thousangs of hours searching this fell into my hands one day.
http://acs.comcen.com.au/atxps.html
it all looks real, the hardest part i think would be the winding of the toroid. indeed im gunna give it ago, eventually. but i figure there are more motivated people out there than me so i figured id share. Reply people with your sucess/failure/opinions and rants.