Folowing
Volenti's inspiration, I'm making a high performance silent evaporator. The materials used are from pressure PVC piping parts, as they are cheaper and with better ID than micro irrigation parts.
The base uses 20mm pipes, with 16mm ID, and the fittings have the ID of the pipes, so there's very little pressure drop from using several stacked Tees and elbows.
I'm still trying to find thin (6mm) PVC pipes for the risers, as I can have a very strong adhesion with the main pipes if they are of the same material, but brass or copper ones are my second option.
I assembled all the base parts without glue, and the fit so tight that is more than enough for the pressures involved in this setup. In fact you need to push very hard to fit all the pieces together.
This is what I have at this stage, actual size is 20 x 35 cm. Up to now materials cost is less than US $2!