Hi Bell,
I strongly encourage you to change your chiller. It is undersized for your tank size. THe total volume is 101 Litres for your system thereabouts max. The Resun chiller is only for volume up to 60Litre. Your chiller is gonna be on all the time and the hot air will come out and warm up the entire environment. TRust me, in Singapore hot environment and if you put the tank and chiller in any room, the occupants are gonna swear! Not only that, you will be using up lots of electricity. For chiller, it is always better to get an oversized one so that it will chill down the water faster and have less heat emitted.
Where will you be facing the cabinet/tank? The wall? Hope that the back of your fish tank is to an open space otherwise the back of the wall will be hot which will in turn heat up your tank.
good luck and keep us posted on your setup.