I am aware of Coutnerparty and other similar implementation. Most of the decentralised exchange implementation till date are built on top of bitcoin chain. Which may be introducing a risk to bitcoin block chain by volume of transactions that are adding on to that chain. And thats where this thought line differs. (i.e. why not create a individual chain for exchange related transactions.)

Looking at users perspective if everyone starts building on top of bitcoin wont it become heavy weight and create issues of size of bitcoin and become a matter of concern for entire ecosystem.

I do not intend to counter your efforts but intend to bring in a different perspective in place