A 22.5" Kettle is the most versatile tool a BBQ cook can have. I smoke, grill, cold smoke and use it as a warmer.
I haven't made any modifications to my grill, but I did have my big cooker modified to carry my Weber on a swing out arm. It works great.
I got tired of carrying it along to every contest we did, assembling and breaking it down every time. Now we just swing it out in to position and light it up. We cook our compitition chicken on it and also have it available to grill dinner on Friday night.
More pictures at dodgecountysmokers.com