Being the designer of this diff cover I just want tell you about some of the key features. Btw, thanks Thomas for adding the pictures.
I´ve added some pics as well:
http://www.tamiyaclub.com/showroom_m...89596&id=13377
The pictures shows the first rough prototype.
As Thomas wrote it is sealed. The only holes are the ones where the belt exit and enter.
I have designed the cover so that the holes are moved forward in the car. It also means that the lower hole is moved up from the lower deck. This reduces the risk of any dust and/or small stones to enter the holes.
There are no screws to attach the cover. The bottom part can be secured with the same screws as the stock rear belt cover. It can also be secured with a screw through the hole in the lower deck if you want to.
The upper cover is held in place by the shock mount/tower. So when you remove the shock mount you can remove the upper cover. When the upper cover is removed you can remove the diff. No need to remove the bottom part, unless you need to change the belt. But it is as easy as removing the top deck.
During last weekends racing it worked excellent. I will test it again in a race next weekend.
I will also add an animation showing how it works.
Yes, I also added a little "bump" on this one to hold the lipos in place.
Let me know if you have any questions.