I built my own table too... for those thinking of doing the same, I have a few additional comments.
John touched on this... build it so that the the angle of the legs matches the angle of the lower arm of the DRDT-2. At first I couldn't figure out why the bottom of the DRDT-2 is sloped they way it is, but then it hit me... duh!
Another thing... Make sure you anchor the DRDT-2 to the table during dimpling. This will allow you to apply more pressure and get better dimples without everything moving around. I use bolts, fender washers and wing nuts to temporarily attach it...
My last comment would be to make sure the lower die is even with or above the surface of the table (carpet). If you are using thick squishy carpet, this isn't such a big deal, but with thin industrial stuff it is. Why? If the die is lower than the surrounding surface, when you dimple, you may end up deforming (denting) a larger area around the hole because the upper ram will want to press the entire area down to meet the lower die. To adjust the height of the lower die, I use washers, and it seems to work fine.
Here is the full shot of my table. It isn't attached to the DRDT-2 in any way, it just sits on top once the DRDT-2 is anchored to the table.
Just my $.02... Good luck!