Heres my driveable 599 with Xl and M motors. Few panels added/moved.Had to work on quite a bit to get a decent r/c.
About this creation
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Had to be creative and move around to get to the drivetrain axis without motor bottoming (i lost about 1/8" on overall ride height cause the small 12t gear sticks out a little).
Heres another lego fan way to get it Rced
http://acapsoft.com/forum/viewtopic.php?f=9&t=22