Hi propolis,
Thanks for contacting us and choosing our product!
About your question delete current menu and using CSS3 module. You can delete it by following steps:
Step 1: Go to path {root}/templates/jux_delphinus/tpls/block then open file header.php
Step 2: Go to line 52 then delete this code
<?php $this->loadBlock ('mainnav') ?>
Note: You can do it but I think you shouldn't delete current menu.(I'm not sure all working fine if you do that - not recommended)