I did similar for my first Joker Poker (rare as hens teeth a few years ago). I'd secured a backglass and playfield, so found a cab from another chime game and put it all together without a hitch. Had the original head so didn't need to make the light board which is a pain (had to remake one for another game that was damaged, not a huge problem, just time consuming as mentioned). Add a pascal all in one to the mix so no ROM issue (and great extra features) and you're done.
Been some talk about maybe some dealer re-birthing Congos as Medieval Madness - I suppose if all the new stuff is in there not such a bad thing, although I hope the background isn't forgotten during the sale pitch!