can there be any wordpress plugin interface for sobi2 ? if so where I'm able to discover the documentation ? I'm not capable of finding any documentation on sobi site.

sobi2 is fairly straightforward: http://sigsiu.net/manual/

Which will enable you to get virtually anywhere you'll need. What questions have you have particularly relevant into it? I have used Sobi2 numerous occasions with positive results - cloning installs to alter the title produces some interesting challenges, but many other activities are pretty straightforward and may be determined after some trial/error.