AFA - as far as, materiel - the covering in front of the insulation (fabric).
Your steps on the process to build frames are right on the money. All my frames are 2'x2'x2" to make the pattern in the previous post. I have 2'x4'x4" ceiling clouds. I have purchased 6" bass traps on top of superchunk in two corners. My back two corners have doors in them, thus the red triangle in the corner (what you can't see is more 6" corner traps on the back wall.
Okay, so step one. Plan (measure twice, cut once). Use a cad program or a draw program or graph paper and a pencil to draw out your walls. Plan where and what you are going to place.
Step two. Make some marks. Get your pencil and make marks on the walls where things will need to be. My mistake you can learn from: I used a magic marker and some of the lines did not cover. Pencil can be erased.
Step three. Trap the corners. Superchunks are best on the wall you face, but corner traps work on the back wall and the wall/ceiling joints. You don't have to cover them all, but at least the four corners (or the front two corners and the ceiling/wall behind you).
Step four. Trap the ceiling. 38% rule applies. Your listening position should be 38% of the room length away from the wall you face. The ceiling cloud should be centered 1/2 way between your speaker and your ears. i.e. if your room is 10 meters long (probably not, but it makes the math easier for demonstration) then your listening position is 3.8 meters from the wall. That's where you want your chair. If you place your speakers .6 meter away from the wall, then the center of the ceiling cloud should be at (3.8+.6)/2 from the wall or 2.2 meters. You also want one at 2.2 from the back wall.
Your room should be sounding a LOT better at this point.
Step 5. Put some tall trapping on the back wall. A pair of 2'x4' traps with 4" or 6" depth, or preferably QRD (quadratic residue diffuser) panels. You'll have to google that one. They're not hard to build and there are several decent DIY vids on YouTube.
Step 6. Trap the sides. If you use a pattern and cover most of the wall, you will probably get away with 2". If you just want to cover primary reflections, you'll want 4" or 6". and now here I will fall away from the norm on this site. On the side walls, there is a use for foam and I think Ethan and John will agree with this point. If you put foam wedge over your side (and rear if you're not building QRDs) it will help your acoustics as they will help with scattering. I don't understand the mathematics behind what this does, but if you need help with that, PM Etan Winer or JHBrant.
Hope this is more to the point. Also, if you PM either of them, get a second opinion on what I'm saying as they have been doing this professionally for a long time!
A) Cut the 1x2 (or 1x4)