Probably not an answer that anyone asking the question is interested in, but the cheapest way to get a large tank capacity is to buy a tank made for a more common/frequently overlanded bike, and then make modifications to suit.
I used an Acerbis 23 litre Honda XR650 tank on on my DR350, cost me just over £100 second hand off eBay in as-new condition. Making brackets to fit it cost me nothing but a night spent in the garage.
If you are doing a long distance trip including going to remote places, then I wouldn't hesitate to spend whatever money needed to get a big petrol tank. Having to fill up with petrol once a day is magic.
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