WP/Tier 2 (ICT) to ILR

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Dear Immigration Experts,

I am in the following situation. Please review and let me know whether I am eligible for UK ILR in my current stay.

I am from India and currently working as a Software Test Analyst under Tier 2 ICT long term visa.

I have got my first WP on June 2009 which was valid for 13 months (i.e. till July 2010).
However I have entered the UK on 16-Jan-2010 to commence my work in the UK. In July 2010, I have applied for my Tier 2 ICT long term visa and got the visa till July 2012.

I took an annual holiday from 14-Feb-2011 to 01-Mar-2011 and was in India during that period.

I returned to the UK on 02-Mar-2011. I have continued my work until 08-Oct-2011 and returned back to India again as my project got completed.

I have got a project again and came to UK on 17-Mar-2012, which means there was a 3 months break.

I have to go back to India in the period 01-Jun-2012 to 23-Jun-2012 for my wedding.

from 23-Jun-2012 I am working continuously in the UK and my ICT visa again extended till July 2014.

Please advice me whether I will become eligible for ILR if I continue to stay in the UK for another 2 years (considering my first arrival in 2010)

If I am not eligible, Will I be eligible if I continue to stay for next 4 years (considering my start date in 17-Mar-2012)?

what documents I need to maintain in both the cases? I do not have any documents other than my payslips.

Many Thanks for your kind advice.