How to edit plugin to use the theme's template files

Question

I am using a theme called Hemingway, it's a great theme with three page layouts. (full-width, with sidebar, without sidebar). This is all working great. I can choose one of three options in page settings.

I'm also using the Projects plugin by Woothemes. This plugin makes it easy to add recent projects with a photo gallery and some other options. It's working when I'm using the shortcode:

[projects limit="12" columns="2" orderby="date" order="desc" exclude_categories=""]

I'm using this shortcode with two columns on a full-width template. This is working great, but when I'm trying to use the functionality to automatically add the content of projects to the page using the option built-in Projects: The full-width template is not working and the sidebar is shown. Also the two column layout for projects is not working. They just aligned beneath eachother.

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How it should look like (this example is with shortcodes):

http://hoveniersbedrijfameland.nl/projecten/

How it looks with the option in projects to choose a page: (this is wrong)

http://hoveniersbedrijfameland.nl/projects/

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How can I debug this to see what breaks it?

What I tried so far:

1. I've tried the plugin to behave like I want. This means, that the plugin will use the full page template for 'categories' instead of using the archive page. I don't really know how the plugin is build, so it's hard to eit the right file.
2. I've tried a workaround with url routing, but this isn't the best approach.

Answer 1

I found a solution. I copied the archive-project.php file to my theme and edited the content with the ones in the full-width template. I need to style it myself because the pages are broken if I leave it like that.

If I want to edit page template now, I need to code it in the ffile instead of choosing it from the pages > page layout in the admin panel. I'll fix that later.

FINAL UPDATE: I hardcoded everything and it's working for me now. I don't need any further help, I'm now looking into the custom post types to change the content template.