I would like to know the approx cost for building the following:

a concrete, above ground, plunge pool

dimensions 6m x 2.5m x 1.5m (depth)

this will have a overflow filtration unit at one end, and a salt filtration system

no need for drains, lights, jacuzzis or fancy stuff

I would tile it, and have wooden decking around it, eventually, so those not included in the cost