I tried doing that when we first got ours, but ended up keeping the Capital Grille. Found a skillet on Amazon that fits exactly, and have also boiled a large pot of water on the grill. So far, so good. The height of the drawer makes it tricky to find the perfect burners and top/guards to retro fit. Hence, why we have kept it so far and pleased with the results.
I have 2 regular grills, one charcoal and one gas, for grilling needs. The Capital Grille is just used as a stove top basically.