Customise open source Perl website

Hello, We would like to make a version of this site: [login to view URL] for Ireland. As you can see, the source code is available here: [login to view URL] I am unsure of all the issues involved in the conversion, so please before you quote could you look at the existing site and make any suggestions as to what issues you think might be involved. For example, we would need to use Google Maps. Also, Ireland does not use postcodes, so this functionality would be redundant. You can see an example of someone who has already made a google maps conversion here: [login to view URL] I believe it runs of MySQL, though I am happy to use any DB format. Windows Server is a preference, but not essential. Thank you for your interest