Yep good idea Darren.
Pure - ill have a look at their website, nice one.
Don't be put off by the pictures. He is not expensive.
Other firms do custom tanks as well mate. As you want to save space it will be the best way.
My idea in my combo was to have a tank made that was say 1000x1250x 300mm high or maybe 350. But here was the secret plan
I was going to have a cut out made in the bottom of the tank and then the water outlet would have been in that cutout
Kinda like this (side on view) _____ _______
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The idea was if it was a 300,350,400 tank or whatever. I would actually be able to suck it dry lol. With wydale tanks sometimes you can lose a good 20 - 50 L !!!