I gather the plan is to buy a plot of less than than 300m2 - build a house (1 single house) - rent/sell it and move on.
But I'm not sure if I understood you correctly when you say that your idea is to build a house that "may appeal to local Balinese". So you are considering the local Balinese as the target market?
Then, maybe you should be starting your research from the other end of the telescope: What's the average Balanese annual income? What can they afford to pay in rent?
What is the culture & religion, how do they affect house design?
What's the average temperature spread.
Why would Balinese rent property when they are in fact bumi putra, own the land and mostly prefer living in traditional courtyard homes? ......I'm not just talking about the 'poor villager'. I know a couple of quite wealthy Balinese who have got rich in the property game, know what Orang Puteh lifestyles look like, and choose to live in a cluster of tiny redbrick buildings... it suits them, their culture, their religion and the climate.... we're certainly not talking Barrat/Wimpy Homes here.
If Balinese are not your target market - sorry for missing that!
Also, have you looked at the visa & corporate aspects of the plan? This isn't Europe, no 'free movement of labour' here - you really can't just come in on a tourist visa, cut a deal on property, then build. You won't be permitted to pick up a hammer, pour concrete or lay a brick without the correct visa and local certification (as a builder).
You can't even rent the property out without the correct paperwork.... plenty of threads in the forum about that (including true stories of people being arrested and instantly deported)