should just need to change the oil you can maybe put some sta-bil in the gas if you want but if you just top it up with fresh stuff and drive it should be ok
it either has to be one of the power outlets or the radio if your not using the power outlet unplug the radio and see if the fuse blows if it doesn't its probably an internal short in the radio
that fuse (should be number 9) runs the radio the accessory relay the cigarette lighter in the ashtray and if equipped the aux power outlet in the center console
hth
you can buy anythin off of a cfc car except for the engine or the car as complete now I suppose if you spend all day you could carry out an entire car in pieces if it was clean enough
http://www.sears.com/shc/s/p_10153_12605_00921754000P
its not homebrew but it is priced reasonable I don't know what kind of money you'd have in building one on your own and then all the time to calibrate it