Hey Thomas,
do you want the above to work for any project or a specific one? If the former, you can try this CSS:
.single-project .post-header { float: left; width: 27%; margin-left: 6%; }
.single-project .post-content { float: right; width: 60% !important; margin-right: 6%; }
I would recommend using shortcodes on a “full-width” layout to create columns of content, however (please see Appendix 2 of the theme manual for the description of available shortcodes).
Regarding your second question – you can update to version 1.5 safely, yet after the update you’ll need to copy over the custom file I’ve provided here in order to get the external menu links to display before the one-page links again.
Sincerely,
Andrii / Satori Studio