Obviously the TF G4 deck is made for quad coil, but the design could use some improvement, IMO. It requires good manual dexterity and patience to build.
For me, a Velocity style deck makes doing quad horizontals a snap. So I would consider the Gemini or something similar. I've ran quads in the Aromamizers since last July. I'm about to put one in Boreas. Yesterday I received an Ijoy Tornado, and did 6 coils, but I'm going to caution you on that RTA. Why? Two reasons. First, the deck is loose. It doesn't have a threaded 510, nor does it screw into the 510 base. So you have to hold it while you coil and wick it. Definitely a pain! That also means to get a resistance reading you need to use a DMM or screw on the chimney barrel to stabilize the deck. That leads to problem 2: you can't pulse to work out your hotspots unless the chimney barrel is on. Kind of hard to work on your coils that way! You have to put on the bottom pair, put on the chimney barrel, pulse and strum. Take off the barrel, put on the middle pair of coils and repeat. Then repeat that process with the third pair! Or use spaced coils to limit hotspots. It's a really cool RTA that just wasn't implemented the way it should've been.