Excellent. It is very nice to see young people make this decision to be debt free. Taking housing loan is a big regret for many Malaysians.

Very nice idea, and even better to see that you have actually done the work to make it happen.

I was curious about some things. Here are my notes in case it helps others understand your efforts.

- water supply
"My neighbour is very generous for offering a help for me to utilize his electricity and water supplies. I bought a very big tank to contain the water for concreting usage."

This is good. Longer term, will you connect to syabas water supply or be independent? I think it will be cooler to be fully self-sufficient. Would you be able to use a rainwater collecting system? I see Teluk Panglima Garang (nice name) is not that far from the sea, so I wonder if the ground water will be sweet or brackish. A friend of mind volunteered at Barefoot College where they build multi-stage rainwater collection tanks. The big tank is dug into the ground, like a house foundation, formwork is used, the walls are concrete and then tiled to make it more waterproof. Assuming you make this about the same size as a 20 ft container (20' x 8' x 8'), then you can store 38m^3 of water which should be enough for family of 4 for 1 month. Selangor gave 20m3 free per month.

The nice thing about this is that the water tank also becomes a stabilizing foundation for your container-home on top. Anyway, just an idea that I like.

- electricity

I think I saw you wrote solar. I think that's the right solution. If you cover your roof, 8' x 20' = 160 ft^2 =~ 14 m^2 . I think ideally, you can get 1367 W/m2 but in reality it is much lower. I remember 10 m^2 can give you about 2kW. But should check those numbers. You'll need inverter, battery. Try to use DC equipment (like DC fan) instead of AC as you'll reduce the power consumption. Also, solar on your roof should reduce rain noise and reduce heat absorption.

I look forward to your progress. Best wishes and Good luck.