The WordPress dashboard is not suitable for my site users.
1) Is it possible to create completely custom looking dashboards?
2) Is it possible with a plugin to create my own "add a post" pages with my own field validations?
The WordPress dashboard is not suitable for my site users.
1) Is it possible to create completely custom looking dashboards?
2) Is it possible with a plugin to create my own "add a post" pages with my own field validations?
Something you might want to try is a plugin called bbpress. You can use it to create an "environment" for your members on your website. It also has a member dashboard that you can modify.
And I am not really sure about your second questions.
Something else you can try doing is look for sites that are similar to yours and check if they are using wordpress.
GD Press Tools (dev4press.com) offers a cool feature that redirects users to a custom page when they login. If anyone uses dev4press products and has logged into the site before, they use their own plugin to accomplish this.
More info:
http://www.dev4press.com/forums/topic/custom-wp-user-dashboard/#post-16995
Also, WordPress has a page about custom admin themes:
http://codex.wordpress.org/Creating_Admin_Themes
And finally, here's an example of someone only changing the style, but doing so in a drastic way and only with a few lines of code.
https://github.com/rachelbaker/bootstrapwp-Twitter-Bootstrap-for-WordPress
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