The original plan for this jetbike (as it was for a few others) was to have a space marine either being hacked apart by the bladevanes, or standing on the ground firing up at the jetbike... like the Razorwing.
This is why it was built up on the taller base. However, I quickly realized that it would be impossible to use in a game as originally conceived, so I pared it down to the shooting marine, which could in turn be removable, just like the Cyberwolf marine can be removed from the Razorwing base.
Hopefully I will get the time to make that space marine figure for this particular base. :-)
In the meantime, here are a few more views of the jetbike by itself.
And here it is with the original color test jetbike...
Much more to come!