After having gone through a similar exercise a few years ago, I would strongly support getting an off the shelf plastic tank vs having a plastic one fabricated.
Due to bad advice we had a tank fabricated, and ultimately tore it out and had a standard one installed. The custom ones are generally welded and quite thick. The welds are weak points and the thickness reduces capacity, assuming that the outside measurements are dictated by available boat space.
We ended up with a stronger and higher capacity tank that was also much, much, cheaper than the custom tanks. Don't recall if it was a Ronco or not.
However, if you are considering having a custom fibreglass tank built in place, that is a whole different story.
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Conrad
Berthed in
Campbell River BC
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