Is there a set of official dimensions for the movement templates or is their validity made only by comparing against a cardboard set from the base game?

Legal Products
Players must use only official Star Wars: X-Wing™ Miniatures Game components in tournament
play, with the following exceptions for third-party components:
• Tokens other than obstacles and bombs
• Range rulers that match the dimensions of an official range ruler or a particular section of
an official range ruler
• Movement templates that match the dimensions of official maneuver templates

Determining the legality of any questionable third-party tokens, range rulers, and movement
templates is the marshal’s responsibility.

I'm looking to have a set of movement templates laser cut from Timascus or other metal alloy for a personal arty finish but would like to assure they are also tournament legal.
Does anyone know what third party companies use?

Putting my FFG templates into a square I get the following dimensions. Can anyone confirm?

Bank 45°

Spd     Inside Radius     Outside Radius
 3            175mm              195mm
 2            125mm              145mm
 1             75mm               95mm

Turn 90°

Spd     Inside Radius     Outside Radius
 3             80mm              100mm
 2           52.5mm             72.5mm
 1             25mm               45mm

All of your banks are 5mm off from what I've seen before. That doesn't mean you are wrong. You won't find official numbers.

If you're using the set from the core box, your set is acceptable. There is some variance, but according to the official rules you're good to go.