I did a bit of searching and came up with some plans sold by Wood Magazine. Although I felt their design was a good starting point, I definitely wanted a longer and deeper version of the couch (since couches are for naps, too, and I don't fit in a standard-sized couch) and I wanted to add a little of my own style - so I used their plans as a basic starting point and went from there. I ended up making the couch 1-1/2" deeper and 6" longer (notice these dimensions are multiples of 3/4"), abandoning some of their details, and adding a few of my own.
I won't be covering in-depth dimensions and details because I feel that wouldn't be fair to the folks at Wood Magazine who's plans I used as a foundation (so, buy those plans!), but I will be pointing out what I consider to be the weak areas in their design and the modifications I did to tailor the design more to my personal preferences. As always I'll include a few of the tricks, trials, and tribulations that go with a project like this.
Originally, I planned on making multiple pieces and selling some of them to pay for materials - buuuuut ...... I never got around to the selling part - lol. I ended up building two settles (couches), a loveseat, and a chair. The settles and chair are constructed from Quarter-sawn (QS) Red Oak, and the loveseat is Philippine Mahogany and Australian Lacewood. I'd also planned on using QS White Oak (the traditional material for these pieces) as I wanted to use the ammonia "fuming" process to create the final color, BUT finding Quarter-sawn White Oak in any appreciable quality/quantity has become a lot harder over the years - so I settled for QS Red Oak. Red Oak, BTW, does NOT turn a nice dark patina like White Oak does when fumed with ammonia - it turns a sickly green. Really weird.
Costs: Building quality furniture isn't exactly cheap - but then costs are relative. I spent about $4000 on materials alone for this entire project - BUT - I produced four pieces of heirloom quality furniture that will (barring an errant nuke or house fire) be around longer than I will. I didn't skimp on any of the materials - it's all top-shelf stuff - and unlike most modern furniture, these are completely rebuild-able. I would imagine that if you wanted to build something a little more budget-conscious, you could build a decent settle for around $650-$800 - but when you consider that these couches sell for upwards of $4000 - $7500 each, $4000 in materials for all of them (not counting labor) isn't all that bad.
Time: It's a bit difficult for me to estimate the time I spent because these were built over a period of around 8 months on and off. I started in the Fall and worked part way through Winter, and so I had to wait for decent weather to spray the final finish - so - a big part of that 8 months was spent with my living room filled with couch frames waiting for it to get above 70 Degrees F outside :) I think a reasonable estimate to build one of these would be roughly 60-80 hours for an intermediate woodworker.