Custom water tank build (for on-board wfp)

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[MENTION=30474]Jackllfixit[/MENTION] - lol, seriously

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@Alex Lacey

As some of you know, I drive a scion xB, outfitted with a 25 gallon sprayer tank that I use for my WFP. This has worked pretty well for us so far, but I’m always thinking about how I’d really like it to be.

So here’s my idea:

The rear foot-well area is a really awkward space to use for equipment- its uneven, has that weird hump in the middle, and is simply under-utilized. I want to build a custom shaped tank that would fill the entire foot-well area, and extend under the front seats (there’s adequate room there to justify the added hassle of complicating the tank’s shape, imo).

Does anyone have experience with custom-built water tanks? Any out-of-the-box ideas to make this as simply and economically as possible? I’m cool with having things a bit ghetto-ish to begin with, I can always dress things up and make it look prettier on the outside…

So far I have considered various methods of fiberglass lay-up, including using a plywood skeleton structure, or building molds from Papier-mâché and bondo. It all looks terribly complicated.

I’ve also thought about building a plywood box, and lining it with a heavy duty plastic sheeting, though I’m concerned about the longevity of such a solution. Heaven forbid I spring a leak, and end up with 35+ gallons in the passenger area…

I’m really just in the brain-storming phase right now, so if you have any ideas, no matter how crazy they may seam, shoot them at me. I’m interested to hear if anyone has thought of doing a similar project for their vehicle.

Thanks

[COLOR=“#0000CD”] outfitted with a 25 gallon tank [/COLOR]can you fit another 25 gallon in the back.Keep it simple. or one square 50 gallon tank in the back.
Custom building a tank will take a lot of time and material and in the end you’ll probably not like the out come,(thats why there are company that build them).

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[COLOR=#333333]A lot of work. Fun project though. That is why I mentioned a pillow tank, will form into the void. Not sure what they cost but one site is readycontainment.com. or atlinc.com. I did see a price on 1. 25 gal @$500. The good thing is they can come right out again. Husky bladder tank holds 25 gal for $236. I would like one because the weight is distributed evenly (dont have to strap down the containers). Also if don’t want to ride around with all the extra weight just transfer water out and it will lie flat in the back. I use my car for other things so not having to unload and store large tanks is a plus for me.
Will be interesting to see how the project progresses.[/COLOR]