Maysville Sports

14 Frame
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HEAVY DUTY 70x14x12 36 Batting Cage Net 1 1 2in Galvanized Steel Frame    US $1,379.00

Commercial 12x14x70 Batting Cage Net Frame L Screen    US $1,583.10

Complete Batting Cage Frame System 12x14x70    US $827.10

HEAVY DUTY 55x14x12 36 Batting Cage Net 1 1 2in Galvanized Steel Frame    US $1,239.00

Cimarron 70x14 Galvanized Steel Commercial Air Frame    US $2,799.00

Cimarron 55x14 Galvanized Steel Commercial Air Frame    US $2,399.00

COMPLETE 70x14x12 Commercial 2inch Galvanized Steel Frame    US $1,039.00

COMPLETE 55x14x12 Commercial 2inch Galvanized Steel Frame    US $899.00

Cimarron 70x14x12 Residential 1 1 2in Galvanized Steel Frame    US $749.95

12 x 14 x 70 36 Batting Cage Net Frame L Screen    US $1,662.30

12 x 14 x 55 36 Batting Cage Net Frame L Screen    US $1,419.30

12 x 14 x 35 36 Batting Cage Net Frame L Screen    US $1,149.30

12 x 14 x 35 42 Batting Cage Net Frame L Screen    US $1,203.30

12 x 14 x 70 42 Batting Cage Net Frame L Screen    US $1,734.30

12 x 14 x 70 Batting Cage Frame 42 Net L Screen    US $1,583.10

12 x 14 x 35 Batting Cage Frame 36 Net L Screen    US $1,122.30

12 x 14 x 35 Batting Cage Frame 42 Net L Screen    US $1,185.30

12 x 14 x 70 Batting Cage Frame 36 Net L Screen    US $1,493.10

Cimarron 70x14x12 Stand Alone Frame    US $1,099.95

Cimarron 55x14x12 Stand Alone Frame    US $929.95

Cimarron 55x14x12 Residential 1 1 2in Galvanized Steel Frame    US $629.95

Economy Batting Cage Frame System W Net 10x14x35    US $599.00

Complete Batting Cage Frame System 12x14x55    US $769.00

12 x 14 x 35 Commercial Batting Cage Frame System    US $494.10

Was the 14.7 billion years time frame a matter of convenience or scientific fact?

Do we have supporting scientific facts or was this 14.7 arrived at by simply saying it took that long from there to here?

You refer to the age of the universe? Astronomical measurements are the main basis for such estimates, and radioactive dating also contributes. I won't try to go into detail, but the astromomical data include recession velocities of distant stars, star lifetime and star evolution sequences.
See the refs for a sampling of cosmological age estimates and their sources.