The Phantom PCB was designed to fit inside the Filco TKL case.
"Winkeyless" layout is possible using any case, if you use an 86-key layout with a 1x key between each Ctrl and Alt. 84-key layout is possible by not installing switches in those positions, but there isn't (yet) a case with a top cover that has cutouts to cover those positions. Maybe someone is working on one...