I looked at entering my old S1 in to concours but after looking at the classes and what other models you would be up against it was a complete piss take, i think at the time due to the car being modified because original parts can no longer be sourced (exhaust) i would have been up against modified cars like FRS, Escos which you can't compete with as their OE parts are still widely available so this is what put me off and i sold the car after 20 miles of use.
To go into a competition to come say last against newer models would be too disheartening after all the hard work that has gone into it.

Just my opinion

Excuse to dig pictures of the old S1 out




But as for your car mate yes it's deffo good enough to enter.