You could always try the Product that came after Platform - The PageLines Framework - available for free as an open source project on GitHub https://github.com/p...Lines-Framework
If you haven't used GitHub before just click download zip on the right of the screen the link takes you to and install that as your theme.
It is more like the look and feel of Platform than of the DMS system. Also a good basis for the DMS if you do decide to give it a go.
You can find the docmentation to get you started - here http://support.pagelines.me/docs/
Platform though is not supported anymore and using it for your site will likely lead to some complication and/or issues as web technologies change.