yes it is a halal restaurant.

No they are closed on boxing days...tomorrow open as usual

I have been there in person when an imam asked why they didn't have a sign advertising that their food was halal. If an imam would eat there and he knows they are halal I think that's a pretty good guarantee that it is halal friendly.

Pickup only

No, it is not that big. Like 40 maybe

No, maybe you could check about renting the restaurant for a night