I'm just curious BKKBILL as there can be a misunderstanding of someones interpretation (or expectation) of western or "farang quality" - in my definition its something above what Somchaislaptogether would be happy to leave you with. Would you consider the expectation of windows not leaking to be a feature of a "western house"? What about level floor tiles that passes the "coin test" - is that a feature of a western house? Walls to be square - is that reserved for a western house??
MUSTY - I'm truly happy for you mate - from the pictures, it certainly looks OK. In fact I'll easily go one further and say it does look good all up. How do you think it will fare during the wet season seeing that its so open?
I can see one thing that they have done which I picked them up on with my house - but on its own it would come across as a bit of a "nit pick" and I'd be curious if you pick it up yourself. However, I can also see something that they have finished off well that they didn't do for me. I reckon reserve your final determination until you can have a close look.
I like your idea about the roof sprinkler, I have come across the idea before either here or somewhere else. The thais will think you are crazy - but who cares I take it you are looking at it for the main house and therefore sounds like you are having heat retention problems like myself. I reckon your big problem is having something durable that could sit up on the roof and deal with the UV and heat. I've only seen plastic sprinklers in the places I've looked in LOS and as a general rule, thai plastic doesn't fare well leaving it in exposed sunlight. If you are really serious about it, I'd be trying to source metal or UV treated sprinklers from home and bringing them over with you. The other option is using soaker houses - once again something of good quality.