I like seeing people add in shrugs. I feel like they are underrated and you can build a lot of back strength when you up the weight. The main thing you should be looking for when you come up with assistance in triumvirate are exercises that are going to help build the main lift. You only have two exercises to do so, so you have to make them count. I would swap out the leg curl for a RDL or a SLDL. I like leg presses, but I know a lot of people do not, so I would leave that up to you. Also, find a better movement than lateral raises. No need in doing those in this template because they do not do a lot for the bench or overhead press. If you wish to do them, do them, but I wouldn't program them as a main triumvirate assistance. Same with the hanging leg raise. If you squat and dead heavy and overhead press heavy, you really don't need direct ab work. Again, if you want to do them, do them, but I wouldn't program it. Switch it out for a quad, hamstring or glute exercise. These are just my opinion though. What are you current strength levels and how old are you, how much do you weigh, etc?