Lets say I buy a nice used Kitfox. Can I convert this to ELSA ?

It has less than 40 hrs on it and has no N number. It also
has a very simple panel, only the min VFR instruments, no avionics.

If I were to plunk down the cash, what would I have to do to
make it legal as an ELSA ?

Would I be able to modify the panel or make cosmetic mods to
the upholstery/seats etc, myself ?