The template is full width, so it should fit widthways fine.
here is a screen cap from my client. Its 2 pages due to length, not width https://dl.dropboxusercontent.com/s/234mccsqf8a6d06/2016-01-27%20at%2015.58.png?dl=0
the length is the major problem and all the fluff. Plain and simple is what I need. Something like this
http://work.empreferredsolutions.com/wp-content/uploads/2016/01/img010.jpg
Well you can use template overrides to remove things from the email templates – also things like the ‘footer’ are optional in settings.
https://docs.woothemes.com/document/template-structure/
Maybe start with the template which outputs addresses – you could make it blank to shorten the email.
You could go in and edit \wp-content\plugins\woocommerce\includes\class-wc-email-new-order.php and start removing stuff (after backing up your website of course). I don’t know how to remove the tables and such from the emails which use a lot of space.