Congrats TRG!
Footprint charts are a great resource for understanding the projected coverage for a satellite based on the msnfacturer's designs. The problem with relying on these footprint charts to recommend reflector size is that they are solely based on a computer model based on a full transponder operated at maximum power and a generous FEC. The calculation does not consider that most transponders are not operated at full saturation and that a reflector must be a minimum size to attenuate unwanted signals from adjacent satellites.
While it is possible that without interference the NASA MUX could be received with a 1 meter reflector, in reality this small reflector would not provide reliable reception. A 1.8m (6 ft) dish would be marginal for receiving the NASA MUX and an 2.4m dish would be the minimum size to be 2 degree for attenuating adjacent satellite interference.