How much can I Cut the Sub Panel F-668

I'm going to be upgrading my 6A (tip up) panel to glass. I'm also going to need more room in the center stack for additional equipment. My question is how much cutting can I do on the Sub Panel F-668? I have searched the site for some examples but can't seem to find anything. Any help or pictures would be greatly appreciated.

Thanks
David

I seem to remember Van's support telling me it was OK to cut as many holes as you need.

Scott, can you confirm this?

Cut your u shaped slot to allow your radios to fit. Then smooth the edge and rivet a piece of angle along the bottom/edges to add some strength and a place for attaching cable support. Piece of cake. Build on.