Hi,
we are expert in joomla and ready to help you to update your joomla version from 1.5 to latest, it's really big deal to update from 1.5 to latest, instead of that i suggest to we just move data whatever you have in your site to joomla latest version and regarding template also we make new one with using latest bootstrap so it's look good in all device.
Can we have a quick discussion over it?
we are look forward to a successful working relationship in the future.
Kind Regards,
Mahendra