Couple of points i want to make here, at the end of the day the owner should driver both cars and should buy in what he's comfortable in, but we have to help and the things i have to say here are:
About the cons in Altis you mentioned:
Flimsy Interior=How is this yaara, i love Altis's interior more than the one in Civic and the old Corolla and also the Imported one aswell. I know the interior may not be solid but it’s your luck if its not, the owner will have to check the car in the showroom before getting the possession of the car.
Noisy=its definitely not noisy, the cabin is really quite and when you rev the engine up, the note is exquisite.
Light body=No car these days have the strong bodies of the old Corona's and car like those. The Altis has a good enough crumble zone to survive accidents. All new cars even in Pakistan have them that are why they have a light body made.
About the brakes of the Altis, i happen to own one and driven Civics’, Alts kay brakes are better than those of the civic. The wheels don’t lock up and you can easily maneuver the car even full brake pedal pushed.