I build the Farmhouse Bed with Arch in queen Size. I built this over the course of a couple days and then finished it slowly over a month. I did modify the bed to have a 6 inch taller footboard. Also, the mattress I have has a low profile box spring that's only 4 inches tall. The mattress itself is about 10 inches tall.
Additionally I changed the plans a little bit to make it modular. The legs of the headboard are mounted on with bolts and the side rails are also bolted on. This allows me to take it apart and move it fairly easily. The other modification I made was because I couldn't find untreated 4x4s. I ended up using two 2x4s with a 1x4 in the middle. Cut everything separately and then glued/nail-gunned the leg together.
Also in the extra pictures you can see the set of Tryde tables I made at the same time. That post will come once I get a finish on them.