rm83/sqft is do-able based on the plan shown and with basic finishing. I completed my house last year and it cost me around rm130/sqft. but my house is much bigger at 6000sqft and with slightly better finishing. The amount of concrete used also quite a lot since part of my roof is concrete roof.
For this to be possible, you cannot engage a contractor; you need to hire the indon workers yourself and be the project manager - manage everything yourself. One important thing is to get a good "chief indon" worker - who can help you manage the other workers. Other than that you will get a bit of headache every now and then ... after then you house will be ready! not impossible at all.

something like this looks simple but actually not that easy to build. concrete formwork must be good ... otherwise, you cannot get this beautiful fair-face concrete.

i have only seen a few houses like this in kl but not as nice as in the picture.