Biggest potential show-stopper  of  a FASR Design:
•This telescope is very unlike most other radio telescopes.  In particular:
–Sensitivity is not a driving force.
•Take advantage of this to allow a
–SIMPLER design, implying HIGHER RELIABILITY
–A FASTER design to build and debug: optimization for sensitivity is not needed, allowing compromises in the design that will have no affect on the science
–A CHEAPER design
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Keep simple. Resist Specification Creep!