Previously I tried to remove the old wooden decking by hand and using hammer and swivel with partial success. It was tedious and tiring process.
Yesterday I bought a multifunctional tool in Lidl and tried it today on the boat. It worked like a charm. I could remove all the wood and silicon glue in a few hours in the afternoon. After I was done I also sanded the whole deck and now I almost have a clean canvas to continue the renovation on.
A few hardwares are still left to be removed. I will have to take out all the stuff from the cabin that are inside, and unscrew the hardwares from below deck.