If you're planning to use it on all bands from 160 through 6, such a construct - when fed with ladder line - must be a half-wavelength long at 80M. This length is subtracted from the total linear space available then the remainder is halved and used as the approximate length of the two end stubs. Once you have that figure, you can plug the main dipole and stub lengths into one of a number of online loaded-dipole calculators and get your coil dimensions.

You don't need traps with this approach...just loading coils.