1) The QCW (Quasi-Continuous-Wave) DRSSTC (Dual-Resonant Solid-State Tesla Coil), developed by Steve Ward, is effectively a DRSSTC with an added power supply that generates a ramped bus voltage to supply the coil. If you have never built a SSTC before, this is a very bad one to start with. If you have built a SSTC, then your next step would be to build a DRSSTC so that you understand the principles. Only after you successfully build a working DRSSTC and understand the theory of operation, and how they differ from a standard SSTC, only then would I suggest trying the QCWDRSSTC.
2) The second coil you show is called a bipolar Tesla coil. It simply places the primary in the center to create two HV outputs at either end that are out-of-phase with each other. These coils tend to be less efficient, but they work.
3) The third coil you show is simply two Tesla coils with the primary coils wired in opposite polarity, so that the HV outputs are 180 degrees out-of-phase with one another. This makes the arcs from each of them attracted to the other. You cannot do this if you want to make a bipolar Tesla coil (image #2) because the "two" secondaries in a bipolar Tesla coil are just two sides of one coil. Building a dual Tesla coil requires building two secondary coils and two toploads, and their phases must be opposite.
If you don't have extensive experience with low voltage electronics, high voltage electronics, and physics, then I do not recommend building a Tesla coil at all.