Had one on an S1S, it was dandy. Needs 15psi fuel pumps, mechanical and backup. I don't know, but suspect, the PS5 may be more tolerant of the FAB without many airflow mods, so changing the fuel pumps, though pricey, may make for a faster overall mod. The electric pump would be much larger than a Facet cube.
Does a PS5C have the same height and footprints as a MS carb? Vapor return also becomes an issue, so might as well actually add a flop tube pickup and inverted oil of same fashion.
The PS5 was plentiful on early Bonanzas and it was decent on many a Pitts, but have not seen many in the RV world.