Hello Lighterman,
We apologize that the unit does not have a back panel but it does not need one. We thought that the customers would prefer a unit that is loaded with some great features such as the Sear X Burner, Side Fryer, Propane Tank Gauge, Heavy Duty Cast Iron Cooking Grates, Able To Be Converted To NG, etc., instead of a back panel. Every grill manufacturer is required to prevent spare tank storage underneath these larger gas grills. This is why we have two tank block bars in place. The reason the tank holder is in the center is because there is an integrated propane tank gauge built into the cart and the gauge is displayed on the front of the bottom cart panel. Let us know what exactly it is you are referring to as "poor workmanship" so that we can review and assists you in the best way possible.
Thank You
Victor