If you are looking for study plans they are available for $15 at Atkin & Co. - Little Maid of Kent
. Construction plans are available at the same address.
You might check out Maid of Endor by John Alden in Forty Wooden Boats. It is only 20' 4" and as such will not be anywhere as difficult to build as Maid of Kent at 30ft.
If I can make a suggestion based upon experience.
I too like to work with wood. The first boat I built was a 16ft wood strip canoe. It gave me real satisfaction in lofting and building it myself. I enjoyed it enough I thought to try and build something a little larger. I settled on a 27ft Controversy that was designed by the Mount Desert Yacht Yard. I liked the lines, it had plenty of room, and used strip planking that I was already used to.
I then started figuring costs to build the thing. After I was done with a preliminary budget I started to wonder if I would like sailing anyway.
What I did was find a 24 ft good old boat that was forty years old at the time but in resonably good shape, sailable anyway. I spent $4000 on the boat, an outboard motor and a twin axle trailer with electric brakes that had been custom fitted for the boat. I figured the trailer was worth $2500, the outboard $700, which left me with an $800 fiberglass boat. Needless to say this was a far cry cheaper then building a boat from scratch.
I spent the next three years sailing the heck out it and along the way beating the heck out of it. I have spent the last three years gutting the interior, repairing holes in the fiberglass hull, redoing the plumbing and the electrical, painting the exterior, replacing the toerails etc. I still have the interior to put back including ripping out the vberth, installing a hanging locker, a new composting toilet, etc. The good news is after another $4000 or so I am ready to go sailing again.
Before you take on building from scratch a thirty foot boat, I would recommend you do the same sort of thing. Buy a good old boat, sail it a bit and see if you like sailing. If not get rid of the hole in the water before you start throwing money in it. But if you do like sailing, rebuild the boat. It will teach you many of the skills you will need to build a boat.