Thirusoolam features not 1 but 3 sivaji's. So, you have guessed right. Even a 70mm screen is not enough.
It is the biggest blockbuster in sivaji's career. Now, when you see it, you roll on the ground with laughter.
The elder sivajis' role is OK where U have the famous telephone scene which was the most talked about scene at that time. The 2nd sivaji is a police inspector & the 3rd is a crook.
The 3rd sivaji makes U laugh from the word go. He wears a big medallion on his neck, covers his paunch with a coat & prances around 16 year old girls, apart from rolling over sripriya.
He hugs VKR & then comments " Unga thoppa idikudhu mama". Incidentally, his paunch is bigger than VKR's. U cannot stop laughing here.
Towards the end, both the sivajis go in a jeep to save their parents. They sing a song " puligal irandu varuginranar". It shud have been "yaanaigal irandu varginranar". To add to the laughter, the crook sivaji makes faces & climbs on to the shoulder of his brother sivaji.
If you want to have 2 1/2 hours of unlimited comedy, watch "Thirusoolam".