Literally would need to spend more money than it likely is worth trying, Jewann needed a jetpack, armor packs, a leggy, his sword and a trisha launcher. And that's him KNOWING what to go for in that base. As a regular player that doesn't play the game like it's their fucking job it's dumb to allow a box around the portal at all like this. Why? Well, as Jewann said it's pretty hard; I mean really if you have dudes who are trying to raid right but are completely surrounded on all sides you don't have a way of attack. Let alone with what you said @Walter the Assaulter and using a C4. You can't use a C4 because the box is wide open and you'd be killed before you can even place it down.
I even thought I heard Kilo say before that "kill boxes aren't allowed" this is basically a kill box. Furthering on from this you have to take into account you have to advert raid now. So you literally don't get the chance to get in before someone knows you're coming.
I recommend allowing a solid wall where it is drawn from the entrance of the Kings Land structure to the outer walls. That way they could at least get some sort of cover to even attempt a proper raid.