At the moment the upper and lower handguards are designed to mate to one another to hold zero, but hypothetically the upper could be used alone with the wooden lower; it just might have the same play as the original wooden one.
Extensions have been considered and I've been messing around with a design relatively similar to the Zenitco you linked. I'm leaning toward selling the handguard on it's own with the ability to attach the extension for users who want it. Pic attached is a concept still, I've printed it and it fit well, but it hasn't been machined and could be pretty different in it's final run. The sling swivel is actually a pain there because I don't want to block it, but that area is important for strength.
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I want this so much. This is beautiful!