Your Rock Crawler seems to be very effective and efficient. Looks very light, it weights 850 grams, and that is its advantage.
What is the gear ratio?
One thing I don't like. It's the modified links. You can say, i'm ortodox about modifying Lego parts (and you're right), and if you do not have needed parts, I suggest you to wait a bit with publishing, and buy parts on Bricklink.
It's not hard to modify parts, but I know, it gives more possibilities. For example you can cut the differential (the one with two gears), to get gear with 24 tooth, and a hole, which can be used in the gearbox.
But, even with modified parts, your Crawler has impresive abilities, and I bet, you can make another one, as good as this, with original parts.
Currently, I'm working on my trial truck, which is Unimog U5000, and it's built for polish competition, so it has no modified parts :D As soon as I'll finish it, I'll show it to you :)