I don’t really do paid work. The forum and even the theme itself are just volunteer work since I don’t always have the time.
1. Doesn’t render correctly on smartphones (only takes up 1/2 screen)
I unfortunately only have an android device to test on. This half screen seems to be an issue with the iPhone. There’s a minor edit on the upcoming version that might resolve this.
You could test this site on your smartphone: http://test.ronangelo.com
If it displays correctly, you could get the updated theme here https://ronangelo.com/stuff/frontier_latest.zip
2. Need help with header sizing & logo placement
3. Minor assistance with choosing a coherent colour scheme
There’s a colors tab on the options page. You could be more specific on what you’re after and we’ll see.