Knowing that this was built for Iron Builder tells me it couldn't have been built in more than a few days at most, probably even a single day - and that blows my mind. It's a rare builder who can create something this good in such a short timeframe. Nice one, Legopard, and best of luck in the arena.
(The seed part is the silver Technic connector, used 18 times; Legopard's challenger is Tim Schwalfenberg (One More Brick). Keep up with the current IB round here.)