[Arran]

The model 66 is a year newer, it was the replacement for the 60 brought out in 1935. I have a 60L from 1933 but I think they carried that lowboy cabinet over into 1934 since the 1934 models have hex knobs and a Bakelite escutcheon. That cabinet was also used with the model 89 chassis and a few others, according to Ron's book and gallery. That cabinet may have been offered with a 66 chassis or it may be a Frankenradio, though a mild one since it's a bolt in.
I would use a filter choke rather then a Pi filter (resistor) either a traditional inductor or a solid state substitute. While you can get away with using a Pi filter in a five tube set a choke filters better with less voltage drop, it can always be bolted to the speaker basket along with the output transformer.
Regards
Arran