I just began my journey to build an ultimate community of people that breathe and bleed performance and have a love for cars, trucks, and motorcycles alike. I would love any and all advice and insight my fellow members are willing to offer.
1. logo - you need a logo created for your site. so that people can see that it's not about xenforo, but about your chosen topic
2. not a bad idea to go on a grey layout. Do play more in the style properties though, so that you can get an unitary color theme.
3. I prefer fixed layouts or at least something that wouldn't stretch the site on wide monitors. Part of your quest to better usability is to have a layout that's wide enough to make sense and narrow enough for the lines of text to be easy to read. A too wide layout will mess with your visitors eyes, since they'd need to read a huge line of text.
great job I like where this is heading.
You could also decrease the space between the content and navigation in the home page, and also the space between the login and the navigation in the forum. I have some more suggestion but I am going to sleep for now, see you tomorrow.