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Ah but if you make the belt out of steel mesh - you do away with any previous belt issues.
wear shouldn't be an issue and it would be easy enough to simply advance the belt a few cm, before you...

Build a delta.
that's pretty much the build volume of the k280: http://www.reprapmall.com/index.php?route=product/product&path=24_73&product_id=117

The conveyor belt idea is great. Use it for x...

only if you add a third axis for height.

nah, still length not height.

Neat bit of kit - but infinite x not z. Z is height.
Still trying to figure out how that canted extruder can print 6 inches straight up.

Cool idea.