Isaan pool recommendations

[Cabradelmar]

We are in Roi Et and are looking to install a simple (by some accounts small) in ground swimming pool. I'd like to keep it well under Bt600,000 (all up). I'm open to salt water. Concrete, fiberglass or liner. 8x4 meter with a 1.5 meter depth (or slightly smaller) would suit us fine. My father in-law and I can do a lot of the manual labor (excavation, etc.). Any suggestions or insights would be appreciated.

[Bagwain]

We supply fiberglass shells (Australian owned BOI factory) if interested. 

Palm Cove shell 8×4.5×1.2-1.6 (or flat 1.5)

Palm Spring Shell  6 x 3 x 1.3

Come fully plumbed so DYI is easy with some consultation.

PM for details