I'll change the hides. I can extend the cage pretty easily so I'll give it a go.Lovely!
However, as you are getting boars, i ought to mention that the best size for two boars is a 2x5 cage. A 2x4 could be pushing it, particularly once they hit their teens. You may find yours are ok with a 2x4 but I know mine weren’t (it was too small for them). You’ll have to see how it goes but do be aware that changing up the cage size after they living in it constitutes a change in territory and could cause more problems than it solves - so best to get issues dealt with before they arise. Also, using enclosed hideys for boars is advised against as it can mean a piggy can be cornered, two exit hideys are best. You just don’t want to cause any pinch points in a cage when you are dealing with boys.
I personally would be very hesitant to use c&c grids as an outside run unless you are going to sit next to the run for the entire time the piggies are out there (and given youngsters can sometimes fit through the grids - I know it’s a while before you are getting yours so they may be big enough to be ok by then) - you would ideally use a wood and fine gauge wire mesh run with a lid for outdoors for safety and security.