So shields are counted as weapons for the purposes of making attacks. With this in mind, I've made a post here talking about using them as your weapon innovation. At level 1, you can get an interesting innovation called Segmented Frame. Not only does this allow you to change a shield's damage type at will (at the cost of an action,) you can also spend an action to turn it to L Bulk and give it the concealed trait. Now imagine, having a huge tower shield that has 4 Bulk getting reduced to L Bulk as an action. It's crazy!
Another innovation that caught my eye was Integrated Gauntlet. This fuses your weapon to a gauntlet and gives the weapon the Free-Hand trait. So now you have a tower shield fused into your FIST that can shrink into said fist at will. I just love how Inventor encourages you to come up with the craziest ideas possible and rewards you for it.
Ok, I've given my 5 cents to the community. Cheers folks!