They don't like one off orders, so they price 'em ridiculously high (about double Ronco's)...you're stuck with their "standard" fittings locations unless you want to pay a HUGE upcharge...and walls are 50% thinner than Ronco.

Let's get together via email...I betcha we can find a bigger Ronco tank that'll fit. Only alternative that's any decent quality would be custom welded tank, which is expensive! I'll email you to give you my email address.