Homemade Garden Spa

Dear all,
I would love to have a Garden Spa Pool but can't justify spending 5K-10K on one, so being the DIY type that I am, I'm trying to dream up a way of building one myself.
Thoughts so far include:-
Strong marine ply construction covered in swimming pool style mozaic tiles (or an alternative - if there is one) and swimming pool style waterproof grout.
Recirculation with a large high capacity pump, using home-made venturi inlets to introduce the air.
Another recirculation pump (maybe a central heating pump), through a 2-3kW in-line water heater.
Obviously I would use all the correct chemicals to keep the water clean etc etc.
Does anyone have any thoughts on this, or maybe point me to some on-line resources !.
Many thanks,
Paul. UK.
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