The harp is a lie.

[Zetonegi]

It's not a manufacturing blueprint, it's concept art.

You're RIGHT
And PUG is a Dragon Warrior because she had dragons for hands. But you're right we need to look at Archer more. Nope I can't get away from the DRAGONS FOR HANDS on the PUG.

And you think this device is equipped to shoot these bolts?

Considering Crossbows use the same underlying mechanics as bows and its been confirmed to transform then yes, it could. A crossbow is essentially a mechanized bow at the cost of range. Let's have a composite longbow, not as effective at close range, that can turn into a crossbow, much more effective at close ranges and less effective at longer ranges.