First off before i continue i do have to say i’m making a plugin and not a theme (as these things seem to be vastly different).
I already created that function as you said (had found that before but it doesn’t really change anything or i’m doing something wrong)
function woocommerce_mytype_add_to_cart() {
wc_get_template( WP_PLUGIN_DIR.'/mypluginname/templates/mytype.php' );
}
I also have my template, but don’t I miss a certain hook or… that lets woocommerce know that it should load my template instead of the standard product template
Also mytype’s extends WC_Product and not WC_Simple_Product (don’t know if it matters for this)