My team did this one a few yrs ago (we’ve all been playing 15yrs+)and we frequently get an ‘itch’ to do a themed loadout . I did Doc , one lad did a caucasian silk , one did Lake and another did Slo . We gave up on the H-harnesses and used normal Alice yokes but cut off a few bits to make them more ‘H’ looking (I also opened the stitching on the cross back panel so I could straighten the straps a bit more then re-stitched it . You can sort most of the gear you need from normal surplus kit that you just need to mod it a bit to look like the real McCoy.
as an example I bought a cheap ass molle pack to use as the trauma pack , cut off all the extra pouches and molle to be left with a big square pack that looked like a real one , bought a bog standard LBV un-picked all the mag pouches (on the standard issue one there angled but lake has the model with vertical pouches) re-stitched them on , sorted !