The wood for this project cost me about $50 from Lowes (and this was combined with making a 3ft square table and another love seat, so in total for all 3 was about $145).
I didn't add the trim pieces (I felt they were unnecessary and more likely to come apart or fall off), I used only 1x3 for the slats on the seat and back, and 1x4 for the seat back top rails. I used 2x3 for the legs because the 2x2 was horrible quality and I used a 2x3 for the front cleat, which I think makes it stronger.
I also didn't attach the back the way the instructions say as I thought all those screws would look ugly, so I fashioned a wooden corner brace to hold the back in place, and used metal corner braces and screws (in 3 places, UNDER the back rest 2x4) to hold the seat back still and then only 2 screws to hold the bottom of the back in place. I added photos of these changes to help you see what I did.
One HUGE TIP - assemble the frame (minus the slats) and stain / paint that part, THEN stain and polyurethane the slats before attaching - it's horrible to try to stain or paint with the slats in place as there are too many tiny gaps to fill!
All in all, I think this plan of Ana's is brilliant - it's simple, rustic looking and yet looks great on my deck - I will take a photo of the 2 sofa and table as soon as the second sofa dries enough to finish assembly.
First sofa took me a little longer as I was getting used to the Kreg, second sofa has taken me about 6 hours in total so far.
One issue I do have is that I think I would use a 2x4 for the top rail of the seat back, simply because the 1x4 has a tendency to split easily.
If you make this project, you won't be sorry, it looks awesome!
Any polyurethane in clear finish to finish it off!
The cushions are from Lowes and cost more than the 2 loveseats and coffee table combined - they cost $160 as I bought 4 (Garden Treasures 46.5 x 25, item no: 332404, normal price $49.98, but I got them on 20% off), they fit perfectly!