For a team with the amount of tools you say you have I would highly recommend using the VEXPro VersaFrame. We use it a lot after build season, and we love using it. It is light and simple to create a mechanism with. I have also seen a fare bit of posts from teams who have built a complete robot using it, and found that their robot's competitiveness increased immensely due to it's reliability (you still need a good strategy though!).
Here is a
quick link to the website for VersaFrame.