The difference between that one and mine is that the old westinghouse unit is that the TXV actually meters the liquid line to the condenser NOT the evap so is called a subcooling valve. The evap becomes a flooded Evap which took me some time to get my head around but my mentor has been making them this way for 25 years and they work very well.
Other than that, the idea of the the SLHX is a good one and should be combined with a bit larger Evap and condenser but sizing those, especially when they are air coils is a real art. Even the manufacturers do more trial and error than you would expect and they don't like to give away their design ideas. I've tried to get it out of them without success.
Jeff, how long of a HX would you put in? I don't think there is much advantage to anything over 6-8".
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