If you want obd2 to 9 pin serial without ELM, you can get it free from me. I got it built from college road as i had the circuit. It is a simple circuit, if you want i can email it to you.
As far as elm323 is concerned, I am still working to get schematics for it, but you can purchase all in one kit from the following URL
http://www.obd2allinone.com/
They have really good prices. Including shipping to islamabad it will cost you around Rs 5-6k.
I am also planning to purchase this elm but before that i want to try making my own :). If you order that then let me know, I would also love to check it out.