Yes I have a bunch of flyback cores, I'll be using them for most of my testing for the next while, they are free, and if they work, then that's perfect. When I get some better results I will buy some cores and design some coils based on what i've learned.
Thanks warp, I'll take a closer look at that step up transformer, first i'll wind my own, then i may consider opening up yours to look inside, and maybe rewind it.