Eswap from iScripts as a Joomla 1.5 Module

I'd like to have "eswap" from iScripts as a Joomla 1.5 Module. Eswap is a open source software, which can be transformed into what we need. I need following customization. Everything what the program offers but without: a) Paypal payment system (I intend to use the joomla ones) b) Template system (I intend to use the joomla one) c) Free to use in every Joomla installation and following modification: a) "Success Fee for Transaction(s)" in percentage instead of a fix amount of money Due the fact, that the script was made in PHP, should be very easy to achieve the aims.. Many thanks in advance