Interesting way to create room, sometimes you have to do what you have to do. As has been mentioned above, you are putting a lot of tension on the loaded side of the chain.
On the quick release, not good, but sure helps while doing mock up. I need to change mine at some point.
Stacking sprockets, I think it's a brilliant low budget way to create off set. I only say that because that is what I have done.
I used the backing plates from the rag joint in the kit to space the two apart.. The last one I used two sets the first try one set wasn't enough, I'll post a few pictures once I get further along.
Considering a few 6mm bolts hold the first sprocket to the aluminium hub, 1/4 in bolts to hold the two is more than enough