Additions/Modifications to a classified script

I need modifications done on a clasified script . Apart from small fixes these features need to be developed as plugins or mods where each plugin provide a particular functionality/feature. They get installed as independent components and add particular functionality to the script. I will provide you help with basic understanding of the script... What code in which files accomplish what.... All for your quicker understanding. For an expert developer it should take only a few hours to get this done and return within the same day(I have a programming background myself so know the estimates).... For your convenience the max time I can allow is 2-3 days for you to get this done. Type 'php/ql/html mix' as first words when you bid. Possibility of ongoing work on sucessful completion. I am online at the moment and I will provide features/modifications details to shortlisted providers. Based on your price and time estimate i will select a provider. THIS WORK WILL START WITHIN TODAY OR WITHIN A FEW HOURS... AS SOON AS I FIND THE RIGHT PROGRAMMER.